Oracle related stuff: Cool Stuff

Showing posts with label Cool Stuff. Show all posts

Wednesday, June 29, 2016

New Version Of XPLAN_ASH Utility

A new version 4.23 of the XPLAN_ASH utility is available for download.

As usual the latest version can be downloaded here.

This version comes only with minor changes, see the change log below.

Here are the notes from the change log:

- Finally corrected the very old and wrong description of "wait times" in the script comments, where it was talking about "in-flight" wait events but that is not correct. ASH performs a "fix-up" of the last 255 samples or so and updates them with the time waited, so these wait events are not "in-flight"

- Removed some of the clean up code added in 4.22 to the beginning of the script, because it doesn't really help much but spooled script output always contained these error messages about non-existent column definitions being cleared

- The "Concurrent I/O" sections will now also be skipped in LIMITED_ASH mode

- Some more fixes to the I/O figures in the "Activity Timeline based on ASH" - the spreading introduced in 4.22 needed some further refinement (see 4.22 change log for more details)

Monday, December 28, 2015

New Version Of XPLAN_ASH Utility

A new version 4.22 of the XPLAN_ASH utility is available for download.

As usual the latest version can be downloaded here.

This version primarily addresses an issue with 12c - if the HIST mode got used to pull ASH information from AWR in 12c it turned out that Oracle forgot to add the new "DELTA_READ_MEM_BYTES" columns to DBA_HIST_ACTIVE_SESS_HISTORY - although it got officially added to V$ACTIVE_SESSION_HISTORY in 12c. So now I had to implement several additional if/then/else constructs to the script to handle this inconsistency. It's the first time that the HIST view doesn't seem to reflect all columns from the V$ view - very likely an oversight rather than by design I assume.

Apart from that the I/O figures (Read Bytes / Write Bytes etc.) in the "Activity Timeline" make more sense for those cases where a process hasn't been sampled for several sample points (see below for more details).

Also in case an execution plan could not be found it is now made more obvious with a corresponding message that you might be able to pull the execution plan from AWR by using different ASH modes (MIXED / HIST).

Here are the notes from the change log:

- Fixed a funny bug that in 12c they have forgotton to add the DELTA_READ_MEM_BYTES to DBA_HIST_ACTIVE_SESS_HISTORY, so in HIST mode with 12c prior XPLAN_ASH versions could error out with invalid column name

- Change the way the I/O figures are treated in the "Activity Timeline based on ASH". Now the I/O per second is spread over the (previous) samples covered by DELTA_TIME. This should give a smoother representation of the I/O performed and much closer to what you see in Real-Time SQL Monitoring reports. The difference to prior versions is only visible in cases where a session wasn't sampled for quite a while and hence has a DELTA_TIME spanning multiple previous sample points. This also means that the I/O related columns in the "Activity Timeline based on ASH" now show only the PER SECOND values, no longer to the totals like prior versions

- Added a SET NULL "" in the configuration and initialization section for SQL*Plus environments that use a non-default SET NULL setting. This screwed up some internal switches so that XPLAN_ASH for example thought it's running in a S-ASH repository

- Added a note to the end of the output if no execution plan could be found and falling back to retrieving plan operation details from ASH. Also added the note to use MIXED or HIST ASH source option if no execution plan could be found in CURR mode, so execution plan has been purged from Shared Pool in the meanwhile

- Cloned the "cleanup" section from the end to the beginning of the script to ensure no current SQL*Plus environment settings influence the script execution. This is particularly relevant if the script execution gets cancelled before the final cleanup section is reached or some other, previous scripts left a mess behind

Thursday, January 22, 2015

New Version Of XPLAN_ASH Utility - In-Memory Support

A new version 4.21 of the XPLAN_ASH utility is available for download. I publish this version because it will be used in the recent video tutorials explaining the Active Session History functionality of the script.

As usual the latest version can be downloaded here.

This is mainly a maintenance release that fixes some incompatibilities of the 4.2 version with less recent versions (10.2 and 11.2.0.1).

As an extra however, this version now differentiates between general CPU usage and in-memory CPU usage (similar to 12.1.0.2 Real-Time SQL Monitoring). This is not done in all possible sections of the output yet, but the most important ones are already covered.

So if you already use the 12.1.0.2 in-memory option this might be helpful to understand how much of your CPU time is spent on in-memory operations vs. non in-memory. Depending on your query profile you might be surprised by the results.

Here are the notes from the change log:

- Forgot to address a minor issue where the SET_COUNT determined per DFO_TREE (either one or two slave sets) is incorrect in the special case of DFO trees having only S->P distributions (pre-12c style). Previous versions used a SET_COUNT of 2 in such a case which is incorrect, since there is only one slave set. 12c changes this behaviour with the new PX SELECTOR operator and requires again two sets.

- For RAC Cross Instance Parallel Execution specific output some formatting and readability was improved (more linebreaks etc.)

- Minor SQL issue fixed in "SQL statement execution ASH Summary" that prevented execution in 10.2 (ORA-32035)

- The NO_STATEMENT_QUEUING hint prevented the "OPTIMIZER_FEATURES_ENABLE" hint from being recognized, therefore some queries failed in 11.2.0.1 again with ORA-03113. Fixed

- "ON CPU" now distinguishes between "ON CPU INMEMORY" and "ON CPU" for in-memory scans

Sunday, January 11, 2015

Video Tutorial: XPLAN_ASH Active Session History - Introduction

I finally got around preparing another part of the XPLAN_ASH video tutorial.

This part is about the main funcationality of XPLAN_ASH: SQL statement execution analysis using Active Session History and Real-Time SQL Monitoring.

In this video tutorial I'll explain what the output of XPLAN_ASH is supposed to mean when using the Active Session History functionality of the script. Before diving into the details of the script output using sample reports I provide some overview and introduction in this part that hopefully makes it simpler to understand how the output is organized and what it is supposed to mean.

This is the initial, general introduction part. More parts to follow.

Sunday, December 21, 2014

New Version Of XPLAN_ASH Utility

A new version 4.2 of the XPLAN_ASH utility is available for download.

As usual the latest version can be downloaded here.

There were no too significant changes in this release, mainly some new sections related to I/O figures were added.

One thing to note is that some of the sections in recent releases may require a linesize larger than 700, so the script's settings have been changed to 800. If you use corresponding settings for CMD.EXE under Windows for example you might have to adjust accordingly to prevent ugly line wrapping.

Here are the notes from the change log:

- New sections "Concurrent activity I/O Summary based on ASH" and "Concurrent activity I/O Summary per Instance based on ASH" to see the I/O activity summary for concurrent activity

- Many averages and medians now also have accompanying minimum and maximum values shown. This isn't as good as having histograms but gives a better idea of the range of values, and how potentially outliers influence the average and deserve further investigations

- Bug fixed: When using MONITOR as source for searching for the most recent SQL_ID executed by a given SID due to some filtering on date no SQL_ID was found. This is now fixed

- Bug fixed: In RAC GV$ASH_INFO should be used to determine available samples

- The "Parallel Execution Skew ASH" indicator is now weighted - so far any activity level per plan line and sample below the actual DOP counted as one, and the same if the activity level was above
The sum of the "ones" was then set relative to the total number of samples the plan line was active to determine the "skewness" indicator

Now the actual difference between the activity level and the actual DOP is calculated and compared to the number of total samples active times the actual DOP
This should give a better picture of the actual impact the skew has on the overall execution

- Most queries now use a NO_STATEMENT_QUEUING hint for environments where AUTO DOP is enabled and the XPLAN_ASH queries could get queued otherwise

- The physical I/O bytes on execution plan line level taken from "Real-Time SQL Monitoring" has now the more appropriate heading "ReadB" and "WriteB", I never liked the former misleading "Reads"/"Writes" heading

Sunday, June 29, 2014

New Version Of XPLAN_ASH Utility

A new version 4.1 of the XPLAN_ASH utility is available for download.

As usual the latest version can be downloaded here.

This version in particular supports now the new 12c "Adaptive" plan feature - previous versions don't cope very well with those if you don't add the "ADAPTIVE" formatting option manually.

Here are the notes from the change log:

- GV$SQL_MONITOR and GV$SQL_PLAN_MONITOR can now be customized in the
settings as table names in case you want to use your own custom monitoring repository that copies data from GV$SQL_MONITOR and GV$SQL_PLAN_MONITOR in order to keep/persist monitoring data. The tables need to have at least those columns that are used by XPLAN_ASH from the original views

- The "Activity Timeline based on ASH" for RAC Cross Instance Parallel Execution shows an additional line break for the GLOBAL summary

- Fixed various bugs related to some figures when analyzing Cross Instance RAC Parallel Execution

- The new "GLOBAL" aggregation level for Cross Instance RAC Parallel Execution (see version 4.0 change log below) is now also shown in the "Information on Parallel Degree based on ASH" section

- The "Parallel Distribution ASH" column on execution plan line level now can show process information taken from Real-Time SQL Monitoring for those processes that are not found in ASH samples.
This effectively means that with monitoring information available for every plan line every involved process will now be shown along with its ASH sample count and rows produced

So some processes will show up now with a sample count of 0.

The idea behind this is to provide more information about row distribution even for those lines/processes that are not covered by the ASH samples.
Previously the rowcount produced was only shown for those processes covered in ASH samples

The new behaviour is default - if you find the output messy you can return to previous behaviour (show only rowcounts for processes found in ASH samples) by setting the new configuration switch "show_monitor_rowcount" to any other value than the default of "YES"

- The "Real-Time SQL Monitoring" information on execution plan line level now includes the read and write request information ("ReadReq", "WriteReq")

- The I/O figures based on ASH now include the new "DELTA_READ_MEM_BYTES" information that was added in 12c. This applies to the following sections:
- SQL Statement I/O Summary based on ASH
- Parallel Worker activity overview based on ASH
- Activity Timeline based on ASH

The "Read Mem Bytes" seems to correspond to the "logical read bytes from cache" statistics, so any direct path reads are not covered by this value

- Added some more verbose description in the "Note" sections how to handle long lines. XPLAN_ASH now does a SET TRIMSPOOL ON if you want to spool the output to a file

- Whenever the output referred to DFOs this was changed to "DFO TREE", which is the correct term

- The "Parallel Worker activity overview based on ASH" section now shows a blank line between the sections which should make this section more readable

- Adaptive plans are now supported by XPLAN_ASH

Note they don't work well with previous versions, the formatting of the inactive lines breaks and the overall information can be misleading if you don't add manually the "ADAPTIVE" formatting option

If XPLAN_ASH detects an adaptive plan, it will always force the ADAPTIVE formatting option.
This also means that Adaptive plans for the time being won't work with SASH as SASH doesn't collect the OTHER_XML column from GV$SQL_PLAN
You could manually add that column to SASH_SQLPLANS and add the column to the "sash_pkg.get_sqlplans" procedure - this is a CLOB column, but INSERT / SELECT should work I think
The view SASH_PLAN_TABLE needs also to be modified to select the OTHER_XML column instead of a dummy NULL

Although this output is less readable than the "faked" output that shows only the plan operations that are actually in use, it is the only simple way how ASH/MONITOR data can be related to execution plan lines, as these hold the information with the actual plan line, not the one that is made up by DBMS_XPLAN.DISPLAY* based on the DISPLAY_MAP information in the OTHER_XML column

Hence I decided for the time being to use the same approach as 12c Real-Time SQL Monitoring and always show the full/adaptive shape of the plan

Another challenge for XPLAN_ASH with adaptive plans is the possibly changing PLAN_HASH_VALUE during execution.

XPLAN_ASH extracts the PLAN_HASH_VALUE from ASH/MONITOR when trying to get the plan from DBA_HIST_SQL_PLAN.

Hence XPLAN_ASH now needs to take care to extract the most recent PLAN_HASH_VALUE, previously it didn't matter as it wasn't supposed to change during execution. This seems to work based on my tests, but it's something to keep in mind

- The new "gather stats on load" 12c feature implies for INSERT...SELECT statements that the cursor will immediately be invalidated/removed from the Library Cache after (successful) execution. So now such
INSERT...SELECT behave like CTAS which also gets removed immediately. This is a pity as you won't be able to pick up the plan from the Library Cache after the execution completes using XPLAN_ASH (or any other tool using DBMS_XPLAN.DISPLAY*).

Although V$SQL_PLAN_MONITOR might keep plan for some time after the execution, it can't be used as input to DBMS_XPLAN.DISPLAY*, hence this isn't a viable workaround. In principle however this isn't a good thing as the SQL and plan information might be missing from AWR / STATSPACK reports due to the
immediate invalidation/removal.

At the time being the only viable workaround known to me for this is to prevent the "gather stats on load" feature either via parameter "_optimizer_gather_stats_on_load" or hint "no_gather_optimizer_statistics", or via using pre-12c optimizer feature settings which implicitly disables the feature which is of course not
really a good workaround as the feature itself might be rather desirable

Saturday, March 29, 2014

New Version Of XPLAN_ASH Utility

A minor update 4.01 to the XPLAN_ASH utility is available for download.

As usual the latest version can be downloaded here.

These are the notes from the change log:

- More info for RAC Cross Instance Parallel Execution: Many sections now show a GLOBAL aggregate info in addition to instance-specific data

- The Parallel Execution Server Set detection and ASSUMED_DEGREE info now makes use of the undocumented PX_STEP_ID and PX_STEPS_ARG info (bit mask part of the PX_FLAGS column) on 11.2.0.2+

- Since version 4.0 added from 11.2.0.2 on the PX *MAX* DOP in the "SQL statement execution ASH Summary" based on the new PX_FLAGS column of ASH it makes sense to add a PX *MIN* DOP in the summary to see at one glance if different DOPs were used or not

- The "Active DOPs" column in the "Activity Timeline based on ASH" was extended/modified: The number in parantheses is no longer the simple count of samples but the Average Active Sessions (AAS) per DFO / bucket.

From 11.2.0.2 it now shows also the DOP of the DFO in brackets, so the
output could look now like this:

1[16] (14.5)

which means DFO 1 at a DOP of 16 had an AAS value of 14.5 for this time
bucket. If there are multiple DFOs active in the time bucket, they are
separated by commas:

1[16] (3.5),2[4] (1.5)

which means DFO 1 at a DOP of 16 had an AAS value of 3.5 and DFO 2 at a
DOP of 4 had an AAS value of 1.5 for this time bucket

A new version 4.1 is already underway that includes new 12c features, so stay tuned.

Monday, December 2, 2013

New Version Of XPLAN_ASH Utility

A new version of the XPLAN_ASH tool (detailed analysis of a single SQL statement execution) is available for download. The previous post includes links to video tutorials explaining what the tool is about.

As usual the latest version can be downloaded here.

The new version comes with numerous improvements and new features. The most important ones are:

Real-Time SQL Monitoring info included
Complete coverage including recursive SQL
Improved performance
12c compatible
Simplified usage

Although I unfortunately haven't managed yet to publish the remaining parts of the video tutorial based on the previous version, I hope now that the new version is out to come up with the most interesting parts soon.

You can watch this short video on my Youtube channel that demonstrates the most important improvements.

Wednesday, May 8, 2013

New Version Of XPLAN_ASH Tool - Video Tutorial

A new major release (version 3.0) of my XPLAN_ASH tool is available for download.

You can download the latest version here.

In addition to many changes to the way the information is presented and many other smaller changes to functionality there is one major new feature: XPLAN_ASH now also supports S-ASH, the free ASH implementation.

If you run XPLAN_ASH in a S-ASH repository owner schema, it will automatically detect that and adjust accordingly.

XPLAN_ASH was tested against the latest stable version of S-ASH (2.3). There are some minor changes required to that S-ASH release in order to function properly with XPLAN_ASH. Most of them will be included in the next S-ASH release as they really are only minor and don't influence the general S-ASH functionality at all.

If you're interested in using XPLAN_ASH with an existing S-ASH installation get in touch with me so I can provide the necessary scripts that apply the necessary changes.

Rather than writing another lengthy blog post about the changes and new features introduced I thought I start a multi-part video tutorial where I explain the purpose of the tool and how to use it based on the new version - some parts of the tutorial will focus on specific functionality of the tool and are therefore probably also quite useful as some kind of general tutorial on that Oracle feature and SQL execution troubleshooting guide in general.

The tutorial will consist of six parts initially, the first two are already available on my Youtube channel - the next ones to follow over time.

Part 1: Introduction, Overview

Part 2: Usage, Parameters, Invocation

Part 3: Rowsource Statistics: TBD

Part 4: Active Session History: TBD

Part 5: Systematic Parallel Execution Skew Analysis & Troubleshooting: Coming Soon

Part 6: Experimental Stuff, Script Configuration And Internals: TBD

Feel free to post questions/requests for clarification that are not covered in the tutorials in the comments section - if there are topics of general interest I might publish a seventh part addressing those questions.

In future I might use that video style more often since it's a nicer way of conveying certain kind of information.

Wednesday, October 24, 2012

New Version Of XPLAN_ASH Utility

A new version 2.0 of the XPLAN_ASH utility introduced here is available for download.

You can download the latest version here.

The change log tracks the following changes:
- Access check
- Conditional compilation for different database versions
- Additional activity summary
- Concurrent activity information (what is/was going on at the same time)
- Experimental stuff: Additional I/O summary
- More pretty printing
- Experimental stuff: I/O added to Average Active Session Graph (renamed to Activity Timeline)
- Top Execution Plan Lines and Top Activities added to Activity Timeline
- Activity Timeline is now also shown for serial execution when TIMELINE option is specified
- From 11.2.0.2 on: We get the ACTUAL DOP from the undocumented PX_FLAGS column added to ASH
- All relevant XPLAN_ASH queries are now decorated with comments so it should be easy to identify them in the Library Cache
- More samples are now covered and a kind of "read consistency" across queries on ASH is introduced
- From 11.2.0.2 on: Executions plans are now pulled from the remote RAC instance Library Cache if necessary
- Separate Parallel Slave activity overview (similar to "Parallel" tab of Real-Time SQL Monitoring)
- Support for the limited ASH capabilities of Oracle 10.2

So that's quite a big list of changes. In particular noteworthy is that the script now supports the limited capabilities of 10gR2 ASH. Although the coolest features of the script (Activity and Parallel Distribution information on Execution Plan line level) are not available with 10g, the remaining stuff still can be very useful - in particular the Parallel Slave and Activity Timeline information for Parallel Execution analysis - so that I believe this is a nice addition for those not yet on 11g and one of most powerful ways of analysing Parallel Execution on 10g.

When enabling Rowsource Statistics you can even get actual Rowsource cardinalities, however not all Parallel Execution plans are supported via DBMS_XPLAN.DISPLAY_CURSOR - Parallel Execution plans using multiple Data Flow Operations (DFOs, see the previous post about XPLAN_ASH for a little bit more info about DFOs) will generate multiple child cursors (one per DFO) and DISPLAY_CURSOR cannot "aggregate" the statistics information across multiple child cursors (besides that the "Rowsource Statistics" attribute is not preserved when enabling it on session level and those multiple child cursors get generated).

Functionality-wise I believe the most important stuff is now covered by this version of the script, and therefore the next releases will focus on fixing the numerous bugs that certainly have been introduced by this new version, and in particular on an improved representation of the information.
Very likely a HTML report similar to the HTML version of Real-Time SQL Monitoring would allow getting a much better overview of the information provided rather than the messy output of the current SQL*Plus query results.

Due to the way the queries on the ASH data are now written, it should be possible to come up with a version that also supports S-ASH, the free ASH implementation.

Summary Of Changes

1. It runs a reasonable pre-check and informs if any of the objects potentially required by the script aren't accessible. You'll see an output similar to the following in such cases:

----------------------------------------------------------------------------------------------
!!Access Check failed!!
----------------------------------------------------------------------------------------------
Error ORA-00942 when accessing GV$SESSION
Error ORA-00942 when accessing V$DATABASE
Error ORA-00942 when accessing GV$ACTIVE_SESSION_HISTORY
Error ORA-00942 when accessing GV$SQL_PLAN_STATISTICS_ALL
Error ORA-00942 when accessing GV$SQL_MONITOR
Error ORA-00942 when accessing DBA_HIST_ACTIVE_SESS_HISTORY
Error ORA-00942 when accessing DBA_HIST_SQL_PLAN

2. Furthermore the script no longer appears to "hang" if privileges are missing or anything else unexpected happens. Actually the script wasn't hanging but usually waited for input with termout set to OFF, since some of the defines populated under regular conditions weren't properly populated when things went wrong. This has been corrected and you should now see the above privilege check output along with regular follow-up error messages, but no hanging script any longer.

3. The output has been re-aligned and further sections have been added. In particular the various "Activity" / "Concurrent Activity" summaries should be helpful to get a better understanding of the overall activity profile of the query and concurrently ongoing database activity. See below for more details about these new sections.

Note that in case of a cross-instance Parallel Execution the summaries will also be provided on instance level in addition.

10.2 Support

Except for a few sections that simply aren't available when running on pre-11g the script shows quite similar information when used with 10.2

The biggest difference when using the script with 10.2 is caused by the fact that 10.2 ASH neither has a clear indicator of a SQL execution instance (the SQL_EXEC_START / SQL_EXEC_ID columns added in 11g) nor is there a relation to the execution plan lines (SQL_PLAN_LINE_ID etc.)

Therefore the SQL_EXEC_START parameter with 10.2 is mandatory, and simply specifies the lower sample time of ASH data to query. Instead of the non-existing SQL_EXEC_ID the script expects a SQL_EXEC_END date input similar to SQL_EXEC_START that obviously determines the upper sample time for ASH data and is also mandatory.

Likewise in 10.2 the script doesn't support searching for the most recent execution like it does on 11g, so - as already outlined - it is up to you to determine what ASH data should be searched for a particular SQL_ID by specifying both SQL_EXEC_START and SQL_EXEC_END.
Note that if the ASH samples at SQL_EXEC_START don't include samples for the SQL_ID in question, then the script uses the "closest" samples to SQL_EXEC_START found within the range SQL_EXEC_START / SQL_EXEC_END to determine the session information that will be used to limit the ASH data.

Short Introduction

Since the initial post what a bit lengthy, allow me to use this opportunity to summarize what the main purpose of the script is:

1. It provides an output that to a significant degree is similar to information provided by the Real-Time SQL Monitoring even in cases where the Real-Time SQL Monitoring report is no longer available.

In particular it allows pulling this information even from the DBA_HIST* views, something that is not possible with Real-Time SQL Monitoring, and therefore allows pulling detailed reports about SQL executions as long as ago as the configured AWR retention.

Note that this is applicable to both serial and Parallel Execution, and the tool can also provide information about currently executing SQL statements.

2. For Parallel Execution, it offers some important clues. Some of them aren't provided elsewhere, even not by Real-Time SQL Monitoring (At least not up to version 11.2):

- It shows information about the Average Active Sessions (AVERAGE_AS column below) with different granularity. This information is crucial in understanding how well the work was distributed among the Parallel Slaves. When looking at the sample report below it becomes immediately obvious that the AVERAGE_AS figures are way below the Parallel degree used.

Global ASH Summary
-----------------------------------------------

INSTANCE_COUNT|FIRST_SAMPLE       |LAST_SAMPLE        |DURATION_SECS|STATUS  |SAMPLE_COUNT|CPU_SAMPLE_COUNT|PERCENTAGE_CPU|SLAVE_COUNT|AVERAGE_AS|MODULE                                                          |ACTION
--------------|-------------------|-------------------|-------------|--------|------------|----------------|--------------|-----------|----------|----------------------------------------------------------------|----------------------------------------------------------------
             2|2012-10-16 10:52:00|2012-10-16 10:52:36|           38|INACTIVE|         190|             182|            96|         59|         5|SQL*Plus                                                        |




Global ASH Summary per Instance
-----------------------------------------------

INSTANCE_ID|FIRST_SAMPLE       |LAST_SAMPLE        |START_ACTIVE|DURATION_SECS|SAMPLE_COUNT|PROCESS_COUNT|AVERAGE_AS|TIME_ACTIVE_GRAPH
-----------|-------------------|-------------------|------------|-------------|------------|-------------|----------|--------------------
          5|2012-10-16 10:52:01|2012-10-16 10:52:36|           2|           36|         111|           30|      3,08| @@@@@@@@@@@@@@@@@@@
          6|2012-10-16 10:52:00|2012-10-16 10:52:31|           1|           32|          79|           30|      2,47| @@@@@@@@@@@@@@@@@




Information on Parallel Degree based on ASH
-----------------------------------------------

INSTANCE_ID|DFO   |START_ACTIVE|DURATION_SECS|SAMPLE_COUNT|PROCESS_COUNT| SET_COUNT|ASSUMED_DEGREE|ACTUAL_DEGREE|AVERAGE_AS|TIME_ACTIVE_GRAPH
-----------|------|------------|-------------|------------|-------------|----------|--------------|-------------|----------|--------------------
          5|Q1    |           2|           36|         111|           30|         2|            15|           16|      3,08| @@@@@@@@@@@@@@@@@@@
          6|Q1    |           2|           31|          78|           29|         2|            15|           16|      2,52| @@@@@@@@@@@@@@@@

In particular the "Parallel Slave activity", which corresponds to the "Parallel" tab of the Real-Time SQL Monitoring and the "Activity Timeline", which corresponds to a mixture of the "Activity" and "Metrics" tab of the Real-Time SQL Monitoring, allows spotting any anomalies regarding skew (both temporal and data distribution skew).

Below example shows that one Parallel Slave is sampled much more than the others. The Activity Timeline (scroll to the right to see the relevant columns) shows that only for a short period of time the expected number of slaves where active at the same time, and a long period of only one average active session.

Parallel Slave activity overview based on ASH
-----------------------------------------------

           |                                                                |          |                    |    SAMPLE|    SAMPLE|          |      |      |TOP                                     |
           |                                                                |    SAMPLE|                    |     COUNT|     COUNT|   PERCENT|MAX   |MAX   |ACTIVE                                  |TOP
INSTANCE_ID|PROCESS                                                         |     COUNT|ACTIVITY_GRAPH      |       CPU|     OTHER|       CPU|PGA   |TEMP  |PLAN LINES                              |ACTIVITIES
-----------|----------------------------------------------------------------|----------|--------------------|----------|----------|----------|------|------|----------------------------------------|----------------------------------------------------------------------
          5|5-P000                                                          |         3|                    |         3|         0|       100| 2026K|      |20(3)                                   |ON CPU(3)
           |5-P001                                                          |         4|                    |         4|         0|       100| 2289K|      |20(4)                                   |ON CPU(4)
           |5-P002                                                          |         4|                    |         4|         0|       100| 2140K|      |20(4)                                   |ON CPU(4)
           |5-P003                                                          |         4|                    |         4|         0|       100| 2026K|      |20(4)                                   |ON CPU(4)
           |5-P004                                                          |         4|                    |         4|         0|       100| 2026K|      |20(4)                                   |ON CPU(4)
           |5-P005                                                          |         4|                    |         4|         0|       100| 2026K|      |20(3),22(1)                             |ON CPU(4)
           |5-P006                                                          |         4|                    |         4|         0|       100| 2009K|      |20(4)                                   |ON CPU(4)
           |5-P007                                                          |        36|@@@@                |        36|         0|       100| 4451K|      |5(28),20(4),4(2),...                    |ON CPU(36)
           |5-P008                                                          |         4|                    |         4|         0|       100| 2026K|      |20(4)                                   |ON CPU(4)
           |5-P009                                                          |         4|                    |         4|         0|       100| 2075K|      |20(4)                                   |ON CPU(4)
           |5-P010                                                          |         4|                    |         4|         0|       100| 2026K|      |20(4)                                   |ON CPU(4)
.
.
.




Activity Timeline based on ASH
-----------------------------------------------

           |             |      |      |          |          |   AVERAGE|TOP                                     |                                                                      |                                                            |AVERAGE
           |             |      |      |          |          |    ACTIVE|ACTIVE                                  |TOP                                                                   |TOP                                                         |ACTIVE SESSIONS
INSTANCE_ID|DURATION_SECS|PGA   |TEMP  |       CPU|     OTHER|  SESSIONS|PLAN LINES                              |ACTIVITIES                                                            |PROCESSES                                                   |GRAPH
-----------|-------------|------|------|----------|----------|----------|----------------------------------------|----------------------------------------------------------------------|------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
          5|            1|      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          6              |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|            2|      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          6              | 1699K|      |         0|         1|         1|2(1)                                    |PX Nsq: PQ load info query(1)                                         |6-sqlplus.exe(1)                                            |*
          5|            3|  122M|   15M|        28|         2|        30|20(16),14(14)                           |ON CPU(28),enq: XL - fault extent map(1),os thread startup(1)         |5-P000(1),5-P001(1),5-P002(1),5-P003(1),5-P004(1),...       |@@@@@@@@@@@@@@@@@@@@@@@@@@@@**
          6              |   99M|   14M|        24|         5|        29|20(16),14(13)                           |ON CPU(24),enq: XL - fault extent map(4),os thread startup(1)         |6-P000(1),6-P001(1),6-P002(1),6-P003(1),6-P004(1),...       |@@@@@@@@@@@@@@@@@@@@@@@@*****
          5|            4|   50M| 6291K|        17|         0|        17|20(15),14(2)                            |ON CPU(17)                                                            |5-P001(1),5-P002(1),5-P003(1),5-P004(1),5-P005(1),...       |@@@@@@@@@@@@@@@@@
          6              |   32M|      |        16|         0|        16|20(16)                                  |ON CPU(16)                                                            |6-P000(1),6-P001(1),6-P002(1),6-P003(1),6-P004(1),...       |@@@@@@@@@@@@@@@@
          5|            5|   33M|      |        16|         0|        16|20(15),22(1)                            |ON CPU(16)                                                            |5-P000(1),5-P001(1),5-P002(1),5-P003(1),5-P004(1),...       |@@@@@@@@@@@@@@@@
          6              |   32M|      |        16|         0|        16|20(16)                                  |ON CPU(16)                                                            |6-P000(1),6-P001(1),6-P002(1),6-P003(1),6-P004(1),...       |@@@@@@@@@@@@@@@@
          5|            6|   33M|      |        16|         0|        16|20(16)                                  |ON CPU(16)                                                            |5-P000(1),5-P001(1),5-P002(1),5-P003(1),5-P004(1),...       |@@@@@@@@@@@@@@@@
          6              |   38M| 7340K|        16|         0|        16|20(15),14(1)                            |ON CPU(16)                                                            |6-P000(1),6-P001(1),6-P002(1),6-P004(1),6-P005(1),...       |@@@@@@@@@@@@@@@@
          5|            7| 4451K|      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|            8| 4451K|      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|            9| 4451K|      |         1|         0|         1|6(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           10| 4451K|      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           11| 4451K|      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           12| 4451K|      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           13| 4451K|      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           14| 4451K|      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           15| 4451K|      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           16| 4451K|      |         1|         0|         1|11(1)                                   |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           17| 4451K|      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           18| 4451K|      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           19| 4451K|      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
.
.
.

Note that it is important to understand that this information doesn't tell you anything about the efficiency of the execution plan performed, it just tells you how many Parallel Slaves were active concurrently on average. Whether the operation performed is efficient or not is a different question, however even an otherwise efficient execution plan might run much longer than necessary if the work isn't distributed well among the Parallel Slaves.

- Furthermore it allows systematic troubleshooting of data distribution skew by showing the number of samples per process on exection plan line level. This makes it easy to spot those execution plan operations that were affected by data distribution skew. Armed with this knowledge it can be systematically evaluated if changing the data distribution method of the corresponding join operations allows influencing this reasonably.

The "Parallel Distribution ASH" and "Parallel Distribution Graph ASH" columns added to the DBMS_XPLAN.DISPLAY* output provide that information.

The "Parallel Distribution ASH" shows the process names along with the number of samples found (in descending order). For Parallel Slaves, this is Pxxx, for all other process names it is the actual name found in the PROCESS column. If the execution is cross-instance, the name is prefixed with the instance number:

--------------------------------------------------------------------------------------------
| Parallel Distribution ASH                             | Parallel Distribution Graph ASH  |
--------------------------------------------------------------------------------------------
|                                                       |                                  |
|                                                       |                                  |
| 6-sqlplus.exe(1)                                      | 0                                |
|                                                       |                                  |
| 5-P007(2)                                             | 0                                |
| 5-P007(28)                                            | 0000000                          |
| 5-P007(1)                                             | 0                                |
|                                                       |                                  |
|                                                       |                                  |
|                                                       |                                  |
|                                                       |                                  |
| 5-P007(1)                                             | 0                                |
|                                                       |                                  |
|                                                       |                                  |
| 5-P021(2),5-P031(2),6-P016(2),6-P031(2),5-P016(1),... | 0123456789ABCDEF0123456789A      |
|                                                       |                                  |
|                                                       |                                  |
|                                                       |                                  |
|                                                       |                                  |
|                                                       |                                  |
| 5-P001(4),5-P002(4),5-P003(4),5-P004(4),5-P006(4),... | 0123456789ABCDEF0123456789ABCDEF |
|                                                       |                                  |
| 5-P005(1)                                             | 0                                |
--------------------------------------------------------------------------------------------

Ideally the number of samples per process should be quite similar, if there is a significant difference, then very likely the underlying cause is an uneven data distribution among the Parallel Slaves.

This is how it should look like ideally:

--------------------------------------------------------------------------------------------
| Parallel Distribution ASH                             | Parallel Distribution Graph ASH  |
--------------------------------------------------------------------------------------------
| 5-P001(4),5-P002(4),5-P003(4),5-P004(4),5-P006(4),... | 0123456789ABCDEF0123456789ABCDEF |

This is how it should not look like:

--------------------------------------------------------------------------------------------
| Parallel Distribution ASH                             | Parallel Distribution Graph ASH  |
--------------------------------------------------------------------------------------------
| 5-P007(28)                                            | 0000000                          |

The "Parallel Distribution Graph ASH" attempts a graphical representation of the information that you see in the "Parallel Distribution ASH" column.

The idea of the "Graph" is that you don't need to work through all the rows of the execution plan in the "Parallel Distribution ASH" column and look at the actual sample numbers, but simply can sweep through the "Graph" in order to easily identify the potential skew candidates.

So, if you have a uniform distribution of work among the Parallel Slaves, you'll see something like this:

0123456789ABCDEF... (it's just 16 repeating hex-characters if you have more than 16 slaves sampled for an execution plan line)

But, if you have a non-uniform distribution of work among the Parallel Slaves, you'll see something like this:

000000000001111223

or in extreme cases

0000000000000

which means that only a few slaves (or only one in the last example) had to do the all of work.

If the graph doesn't correspond to what you think to see in the "Parallel Distribution ASH" column - the distribution of work looks skewed, but the graph doesn't correspond to what I've just explained, then try the "ASH,DISTRIB,TIMELINE" option instead.

In this case even a single sample of a single Parallel Slave will show up as a very wide (so this option might produce false positives):

0000000000000000000000000

which you then need to cross-check with the "Parallel Distribution ASH" column for relevance: If you have only have a few samples per line, then it is probably not relevant since you simply haven't spend significant time there.

But the advantage of this representation is that skew becomes more visible that might not be obvious when using the default DISTRIB_REL option.

The underlying reason is that the default option shows the distribution graph relative to the operation with the greatest number of samples assigned to. So if there are execution plan lines with a much higher sample number than the remaining lines (but these samples are not skewed), the graph might be so compressed that the skew doesn't become obvious.

Section Overview For Version 2.0

General Information

General information
-----------------------------------------------

SQL_ID       |CHILD_NUMBER|SQL_EXEC_START     |SQL_EXEC_ID|FORMAT_OPTION            |LAST_EXEC_SOURCE|ASH_OPTIONS             |ASH_SOURCE
-------------|------------|-------------------|-----------|-------------------------|----------------|------------------------|----------
3pfa4kgc92z10|           1|2012-10-16 10:51:59|  100663297|ADVANCED                 |SID=446@6       |ASH,DISTRIB_REL,TIMELINE|CURR

This section as in the previous version shows some general info and the options used so that it can be verified that the report is about the intended SQL execution.

Global ASH Summary

Global ASH Summary
-----------------------------------------------

INSTANCE_COUNT|FIRST_SAMPLE       |LAST_SAMPLE        |DURATION_SECS|STATUS  |SAMPLE_COUNT|CPU_SAMPLE_COUNT|PERCENTAGE_CPU|SLAVE_COUNT|AVERAGE_AS|MODULE                                                          |ACTION
--------------|-------------------|-------------------|-------------|--------|------------|----------------|--------------|-----------|----------|----------------------------------------------------------------|----------------------------------------------------------------
             2|2012-10-16 10:52:00|2012-10-16 10:52:36|           38|INACTIVE|         190|             182|            96|         59|         5|SQL*Plus                                                        |




Global ASH Summary per Instance
-----------------------------------------------

INSTANCE_ID|FIRST_SAMPLE       |LAST_SAMPLE        |START_ACTIVE|DURATION_SECS|SAMPLE_COUNT|PROCESS_COUNT|AVERAGE_AS|TIME_ACTIVE_GRAPH
-----------|-------------------|-------------------|------------|-------------|------------|-------------|----------|--------------------
          5|2012-10-16 10:52:01|2012-10-16 10:52:36|           2|           36|         111|           30|      3,08| @@@@@@@@@@@@@@@@@@@
          6|2012-10-16 10:52:00|2012-10-16 10:52:31|           1|           32|          79|           30|      2,47| @@@@@@@@@@@@@@@@@

Similar to the previous version this section shows a general summary of the ASH samples found for this SQL execution. If a cross-instance execution is detected, the summary will also be shown on instance level in addition which allows understanding to what extend the instances where involved in the execution.

Global ASH Summary for concurrent activity

Global ASH Summary for concurrent activity
-----------------------------------------------

INSTANCE_ID|SAMPLE_COUNT|CPU_SAMPLE_COUNT|PERCENTAGE_CPU|AVERAGE_AS|FOREGROUND_COUNT|BACKGROUND_COUNT|SLAVE_COUNT|CLIENT_COUNT|PROCESS_COUNT|TRANSACT_COUNT|SQL_ID_COUNT|SQL_EXECUTION_COUNT|MODULE_COUNT|ACTION_COUNT
-----------|------------|----------------|--------------|----------|----------------|----------------|-----------|------------|-------------|--------------|------------|-------------------|------------|------------
          5|           6|               2|            33|       ,16|               1|               5|          0|           1|            4|             0|           0|                  1|           1|           0
          6|           4|               1|            25|       ,11|               0|               4|          0|           1|            4|             0|           0|                  1|           0|           0

This is a new section that takes advantage of the fact that ASH data covers all activity and therefore shows a summary of the ASH samples found during the execution that do not belong to this SQL execution. This can provide important clues why you might see variations in runtime although execution plans and data are similar. Note that for cross-instance executions the concurrent activity covered is limited to the instances participating in the execution. Although in principle the activity on instances not participating can also influence this SQL execution for various reasons I have decided to exclude that information - which can of course easily be changed in the corresponding queries.

Concurrent Activity Summary (not this execution)

Concurrent Activity Summary (not this execution)
-----------------------------------------------

INSTANCE_ID|ACTIVITY                                          |ACTIVITY_CLASS      |SAMPLE_COUNT|PERCENTAGE|ACTIVITY_GRAPH
-----------|--------------------------------------------------|--------------------|------------|----------|--------------------
          5|reliable message                                  |Other               |           3|        30|@@@@@@
           |ON CPU                                            |ON CPU              |           2|        20|@@@@
           |SQL*Net break/reset to client                     |Application         |           1|        10|@@
          6|ASM file metadata operation                       |Other               |           1|        10|@@
           |enq: PV - syncstart                               |Other               |           1|        10|@@
           |control file parallel write                       |System I/O          |           1|        10|@@
           |ON CPU                                            |ON CPU              |           1|        10|@@

This is again a new section with a more detailed breakdown of the concurrent activity. For cross-instance executions this will be on instance level.

Information on Parallel Degree based on ASH

Information on Parallel Degree based on ASH
-----------------------------------------------

INSTANCE_ID|DFO   |START_ACTIVE|DURATION_SECS|SAMPLE_COUNT|PROCESS_COUNT| SET_COUNT|ASSUMED_DEGREE|ACTUAL_DEGREE|AVERAGE_AS|TIME_ACTIVE_GRAPH
-----------|------|------------|-------------|------------|-------------|----------|--------------|-------------|----------|--------------------
          5|Q1    |           2|           36|         111|           30|         2|            15|           16|      3,08| @@@@@@@@@@@@@@@@@@@
          6|Q1    |           2|           31|          78|           29|         2|            15|           16|      2,52| @@@@@@@@@@@@@@@@

This section is more or less unchanged to the previous version and only shows up if Parallel Execution gets used, you're running 11g+ and an execution plan could be found for the SQL statement.

It will show details about the different Data Flow Operations (DFOs) a Parallel Execution could consist of, in particular the activity related to each DFO, the Parallel Degree per DFO (could be different per DFO) and if the DFOs were active at the same time or not. In case of a cross-instance Parallel Execution this information will be broken down per participating instance.

Note that from 11.2.0.2 on the actual Parallel Degree is stored in the newly added PX_FLAGS column of the ASH data, so you get an additional column ACTUAL_DEGREE, whereas the ASSUMED_DEGREE uses the number of sampled slaves and the execution plan operations from the corresponding execution plan section for an educated guess about the degree.

Parallel Slave activity overview based on ASH

Parallel Slave activity overview based on ASH
-----------------------------------------------

           |                                                                |          |                    |    SAMPLE|    SAMPLE|          |      |      |TOP                                     |
           |                                                                |    SAMPLE|                    |     COUNT|     COUNT|   PERCENT|MAX   |MAX   |ACTIVE                                  |TOP
INSTANCE_ID|PROCESS                                                         |     COUNT|ACTIVITY_GRAPH      |       CPU|     OTHER|       CPU|PGA   |TEMP  |PLAN LINES                              |ACTIVITIES
-----------|----------------------------------------------------------------|----------|--------------------|----------|----------|----------|------|------|----------------------------------------|----------------------------------------------------------------------
          5|5-P000                                                          |         3|                    |         3|         0|       100| 2026K|      |20(3)                                   |ON CPU(3)
           |5-P001                                                          |         4|                    |         4|         0|       100| 2289K|      |20(4)                                   |ON CPU(4)
           |5-P002                                                          |         4|                    |         4|         0|       100| 2140K|      |20(4)                                   |ON CPU(4)
           |5-P003                                                          |         4|                    |         4|         0|       100| 2026K|      |20(4)                                   |ON CPU(4)
           |5-P004                                                          |         4|                    |         4|         0|       100| 2026K|      |20(4)                                   |ON CPU(4)
           |5-P005                                                          |         4|                    |         4|         0|       100| 2026K|      |20(3),22(1)                             |ON CPU(4)
           |5-P006                                                          |         4|                    |         4|         0|       100| 2009K|      |20(4)                                   |ON CPU(4)
           |5-P007                                                          |        36|@@@@                |        36|         0|       100| 4451K|      |5(28),20(4),4(2),...                    |ON CPU(36)
           |5-P008                                                          |         4|                    |         4|         0|       100| 2026K|      |20(4)                                   |ON CPU(4)
           |5-P009                                                          |         4|                    |         4|         0|       100| 2075K|      |20(4)                                   |ON CPU(4)
           |5-P010                                                          |         4|                    |         4|         0|       100| 2026K|      |20(4)                                   |ON CPU(4)
           |5-P011                                                          |         4|                    |         4|         0|       100| 2009K|      |20(4)                                   |ON CPU(4)
           |5-P012                                                          |         4|                    |         4|         0|       100| 2009K|      |20(4)                                   |ON CPU(4)
           |5-P013                                                          |         4|                    |         4|         0|       100| 2026K|      |20(4)                                   |ON CPU(4)
           |5-P014                                                          |         4|                    |         4|         0|       100| 2009K|      |20(4)                                   |ON CPU(4)
           |5-P015                                                          |         4|                    |         4|         0|       100| 2009K|      |20(4)                                   |ON CPU(4)
           |5-P016                                                          |         1|                    |         1|         0|       100| 6286K| 1049K|14(1)                                   |ON CPU(1)
           |5-P017                                                          |         1|                    |         1|         0|       100| 6286K| 1049K|14(1)                                   |ON CPU(1)
           |5-P018                                                          |         1|                    |         1|         0|       100| 6286K| 1049K|14(1)                                   |ON CPU(1)
           |5-P019                                                          |         1|                    |         1|         0|       100| 6221K| 1049K|14(1)                                   |ON CPU(1)
           |5-P020                                                          |         1|                    |         0|         1|         0| 7007K| 1049K|14(1)                                   |enq: XL - fault extent map(1)
           |5-P021                                                          |         2|                    |         2|         0|       100| 9170K| 3146K|14(2)                                   |ON CPU(2)
           |5-P024                                                          |         1|                    |         1|         0|       100| 6221K| 1049K|14(1)                                   |ON CPU(1)
           |5-P025                                                          |         1|                    |         1|         0|       100| 6680K| 1049K|14(1)                                   |ON CPU(1)
           |5-P026                                                          |         1|                    |         0|         1|         0| 6352K| 1049K|14(1)                                   |os thread startup(1)
           |5-P027                                                          |         1|                    |         1|         0|       100| 6221K| 1049K|14(1)                                   |ON CPU(1)
           |5-P028                                                          |         1|                    |         1|         0|       100| 6221K| 1049K|14(1)                                   |ON CPU(1)
           |5-P029                                                          |         1|                    |         1|         0|       100| 6286K| 1049K|14(1)                                   |ON CPU(1)
           |5-P030                                                          |         1|                    |         1|         0|       100| 6221K| 1049K|14(1)                                   |ON CPU(1)
           |5-P031                                                          |         2|                    |         2|         0|       100| 9956K| 3146K|14(2)                                   |ON CPU(2)
          6|6-P000                                                          |         4|                    |         4|         0|       100| 2026K|      |20(4)                                   |ON CPU(4)
           |6-P001                                                          |         4|                    |         4|         0|       100| 1961K|      |20(4)                                   |ON CPU(4)
           |6-P002                                                          |         4|                    |         4|         0|       100| 1895K|      |20(4)                                   |ON CPU(4)
           |6-P003                                                          |         3|                    |         3|         0|       100| 1961K|      |20(3)                                   |ON CPU(3)
           |6-P004                                                          |         4|                    |         4|         0|       100| 2026K|      |20(4)                                   |ON CPU(4)
           |6-P005                                                          |         4|                    |         4|         0|       100| 2026K|      |20(4)                                   |ON CPU(4)
           |6-P006                                                          |         4|                    |         4|         0|       100| 2026K|      |20(4)                                   |ON CPU(4)
           |6-P007                                                          |         4|                    |         4|         0|       100| 1961K|      |20(4)                                   |ON CPU(4)
           |6-P008                                                          |         4|                    |         4|         0|       100| 1961K|      |20(4)                                   |ON CPU(4)
           |6-P009                                                          |         4|                    |         4|         0|       100| 1961K|      |20(4)                                   |ON CPU(4)
           |6-P010                                                          |         4|                    |         4|         0|       100| 2026K|      |20(4)                                   |ON CPU(4)
           |6-P011                                                          |         4|                    |         4|         0|       100| 2026K|      |20(4)                                   |ON CPU(4)
           |6-P012                                                          |         4|                    |         4|         0|       100| 1895K|      |20(4)                                   |ON CPU(4)
           |6-P013                                                          |         4|                    |         4|         0|       100| 2026K|      |20(4)                                   |ON CPU(4)
           |6-P014                                                          |         4|                    |         4|         0|       100| 2026K|      |20(4)                                   |ON CPU(4)
           |6-P015                                                          |         4|                    |         4|         0|       100| 1961K|      |20(4)                                   |ON CPU(4)
           |6-P016                                                          |         2|                    |         1|         1|        50| 8056K| 7340K|14(2)                                   |ON CPU(1),os thread startup(1)
           |6-P017                                                          |         1|                    |         0|         1|         0| 5107K| 1049K|14(1)                                   |enq: XL - fault extent map(1)
           |6-P019                                                          |         1|                    |         1|         0|       100| 5107K| 1049K|14(1)                                   |ON CPU(1)
           |6-P020                                                          |         1|                    |         1|         0|       100| 5107K| 1049K|14(1)                                   |ON CPU(1)
           |6-P021                                                          |         1|                    |         1|         0|       100| 5172K| 1049K|14(1)                                   |ON CPU(1)
           |6-P022                                                          |         1|                    |         0|         1|         0| 5107K| 1049K|14(1)                                   |enq: XL - fault extent map(1)
           |6-P025                                                          |         1|                    |         1|         0|       100| 5107K| 1049K|14(1)                                   |ON CPU(1)
           |6-P026                                                          |         1|                    |         1|         0|       100| 5172K| 1049K|14(1)                                   |ON CPU(1)
           |6-P027                                                          |         1|                    |         1|         0|       100| 5107K| 1049K|14(1)                                   |ON CPU(1)
           |6-P028                                                          |         1|                    |         0|         1|         0| 5172K| 1049K|14(1)                                   |enq: XL - fault extent map(1)
           |6-P029                                                          |         1|                    |         0|         1|         0| 5172K| 1049K|14(1)                                   |enq: XL - fault extent map(1)
           |6-P030                                                          |         1|                    |         1|         0|       100| 5172K| 1049K|14(1)                                   |ON CPU(1)
           |6-P031                                                          |         2|                    |         2|         0|       100| 7007K| 8389K|14(2)                                   |ON CPU(2)
           |6-sqlplus.exe                                                   |         1|                    |         0|         1|         0| 1699K|      |2(1)                                    |PX Nsq: PQ load info query(1)

This new section corresponds to the "Parallel" tab of the Real-Time SQL Monitoring and only shows up if Parallel Execution was detected. In particular for 10g it is very helpful for Parallel Execution analysis since the even more helpful analysis on Execution Plan line level is not available.

It will show the activities found in the ASH data per every process sampled as part of the Parallel Execution.

The most useful information in this section is very likely the "Activity Graph" column as it allows easily spotting distribution problems, although it doesn't allow the systematic troubleshooting of such issues that the execution plan line level information does, as explained above.
Depending on the version also the "Top Activities" and "Top Active Plan Lines" will also be shown per process. As usual the N of the Top N can be configured in the configuration section of the script.

Activity Class Summary

Activity Class Summary
-----------------------------------------------

ACTIVITY_CLASS      |SAMPLE_COUNT|PERCENTAGE|ACTIVITY_GRAPH
--------------------|------------|----------|--------------------
ON CPU              |         182|        96|@@@@@@@@@@@@@@@@@@@
Other               |           6|         3|@
Concurrency         |           2|         1|




Activity Class Summary per Instance
-----------------------------------------------

INSTANCE_ID|ACTIVITY_CLASS      |SAMPLE_COUNT|PERCENTAGE|ACTIVITY_GRAPH
-----------|--------------------|------------|----------|--------------------
          5|ON CPU              |         109|        57|@@@@@@@@@@@
           |Other               |           1|         1|
           |Concurrency         |           1|         1|
          6|ON CPU              |          73|        38|@@@@@@@@
           |Other               |           5|         3|@
           |Concurrency         |           1|         1|

This is again a new section that summarizes the activity found for this SQL execution and in principle corresponds to some part of the header information shown in Real-Time SQL Monitoring.

The activity is broken down between CPU and non-CPU, and for non-CPU the different Activity Classes will be shown. In case of a cross-instance Parallel Execution this section will be repeated, this time broken down per instance.

Activity Summary

Activity Summary
-----------------------------------------------

ACTIVITY                                          |ACTIVITY_CLASS      |SAMPLE_COUNT|PERCENTAGE|ACTIVITY_GRAPH
--------------------------------------------------|--------------------|------------|----------|--------------------
ON CPU                                            |ON CPU              |         182|        96|@@@@@@@@@@@@@@@@@@@
enq: XL - fault extent map                        |Other               |           5|         3|@
os thread startup                                 |Concurrency         |           2|         1|
PX Nsq: PQ load info query                        |Other               |           1|         1|




Activity Summary per Instance
-----------------------------------------------

INSTANCE_ID|ACTIVITY                                          |ACTIVITY_CLASS      |SAMPLE_COUNT|PERCENTAGE|ACTIVITY_GRAPH
-----------|--------------------------------------------------|--------------------|------------|----------|--------------------
          5|ON CPU                                            |ON CPU              |         109|        57|@@@@@@@@@@@
           |os thread startup                                 |Concurrency         |           1|         1|
           |enq: XL - fault extent map                        |Other               |           1|         1|
          6|ON CPU                                            |ON CPU              |          73|        38|@@@@@@@@
           |enq: XL - fault extent map                        |Other               |           4|         2|
           |os thread startup                                 |Concurrency         |           1|         1|
           |PX Nsq: PQ load info query                        |Other               |           1|         1|

This new section corresponds to the previous one but shows a more granular breakdown of the activity on wait event level rather than wait class. Apart from that the same applies as above, also it will be repeated in case of a cross-instance Parallel Execution on instance level.

Activity Timeline based on ASH

Activity Timeline based on ASH
-----------------------------------------------

           |             |      |      |          |          |   AVERAGE|TOP                                     |                                                                      |                                                            |AVERAGE
           |             |      |      |          |          |    ACTIVE|ACTIVE                                  |TOP                                                                   |TOP                                                         |ACTIVE SESSIONS
INSTANCE_ID|DURATION_SECS|PGA   |TEMP  |       CPU|     OTHER|  SESSIONS|PLAN LINES                              |ACTIVITIES                                                            |PROCESSES                                                   |GRAPH
-----------|-------------|------|------|----------|----------|----------|----------------------------------------|----------------------------------------------------------------------|------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
          5|            1|      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          6              |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|            2|      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          6              | 1699K|      |         0|         1|         1|2(1)                                    |PX Nsq: PQ load info query(1)                                         |6-sqlplus.exe(1)                                            |*
          5|            3|  122M|   15M|        28|         2|        30|20(16),14(14)                           |ON CPU(28),enq: XL - fault extent map(1),os thread startup(1)         |5-P000(1),5-P001(1),5-P002(1),5-P003(1),5-P004(1),...       |@@@@@@@@@@@@@@@@@@@@@@@@@@@@**
          6              |   99M|   14M|        24|         5|        29|20(16),14(13)                           |ON CPU(24),enq: XL - fault extent map(4),os thread startup(1)         |6-P000(1),6-P001(1),6-P002(1),6-P003(1),6-P004(1),...       |@@@@@@@@@@@@@@@@@@@@@@@@*****
          5|            4|   50M| 6291K|        17|         0|        17|20(15),14(2)                            |ON CPU(17)                                                            |5-P001(1),5-P002(1),5-P003(1),5-P004(1),5-P005(1),...       |@@@@@@@@@@@@@@@@@
          6              |   32M|      |        16|         0|        16|20(16)                                  |ON CPU(16)                                                            |6-P000(1),6-P001(1),6-P002(1),6-P003(1),6-P004(1),...       |@@@@@@@@@@@@@@@@
          5|            5|   33M|      |        16|         0|        16|20(15),22(1)                            |ON CPU(16)                                                            |5-P000(1),5-P001(1),5-P002(1),5-P003(1),5-P004(1),...       |@@@@@@@@@@@@@@@@
          6              |   32M|      |        16|         0|        16|20(16)                                  |ON CPU(16)                                                            |6-P000(1),6-P001(1),6-P002(1),6-P003(1),6-P004(1),...       |@@@@@@@@@@@@@@@@
          5|            6|   33M|      |        16|         0|        16|20(16)                                  |ON CPU(16)                                                            |5-P000(1),5-P001(1),5-P002(1),5-P003(1),5-P004(1),...       |@@@@@@@@@@@@@@@@
          6              |   38M| 7340K|        16|         0|        16|20(15),14(1)                            |ON CPU(16)                                                            |6-P000(1),6-P001(1),6-P002(1),6-P004(1),6-P005(1),...       |@@@@@@@@@@@@@@@@
          5|            7| 4451K|      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|            8| 4451K|      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|            9| 4451K|      |         1|         0|         1|6(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           10| 4451K|      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           11| 4451K|      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           12| 4451K|      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           13| 4451K|      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           14| 4451K|      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           15| 4451K|      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           16| 4451K|      |         1|         0|         1|11(1)                                   |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           17| 4451K|      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           18| 4451K|      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           19| 4451K|      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           20| 4451K|      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           21| 4451K|      |         1|         0|         1|4(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           22| 4451K|      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           23| 4451K|      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           24| 4451K|      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           25| 4451K|      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           26| 4451K|      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           27| 4451K|      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           28| 4451K|      |         1|         0|         1|4(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           29| 4451K|      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           30| 4451K|      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           31| 4451K|      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           32| 4451K|      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           33| 4451K|      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              | 7007K| 8389K|         1|         0|         1|14(1)                                   |ON CPU(1)                                                             |6-P031(1)                                                   |@
          5|           34| 4451K|      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           35| 4451K|      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           36| 4451K|      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           37| 4451K|      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           38| 4386K|      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |         0|         0|         0|                                        |                                                                      |                                                            |

This section was previously called "Average Active Session Graph", but since a lot of information has been added it is now called "Activity Timeline" and will also be shown for serial execution if the "TIMELINE" option was specified.

In addition to the already previously available information about the average active sessions and their activity (CPU or non-CPU) plus PGA/TEMP now the top active plan lines (11g+), activities and processes per bucket will be shown. Note that the N of the "Top N sections" can be configured in the "configuration" section of the script.

Activity on execution plan line level

Activity on execution plan line level
-----------------------------------------------
Wrote file .xplan_ash_temp
SQL_ID  3pfa4kgc92z10, child number 1
-------------------------------------
select max(t1_id), max(t1_filler), max(t2_id), max(t2_filler),
max(t3_id), max(t3_filler) from ( select /*+ monitor no_merge
parallel(t1 16 2) PQ_DISTRIBUTE(T1 HASH HASH) */        t1.id     as
t1_id      , regexp_replace(t3_filler, '^\s+([[:alnum:]]+)\s+$',
lpad('\1', 10), 1, 1, 'c') as t1_filler      , v1.* from   (
select /*+ no_merge parallel(t2 16 2) parallel(t3 16 2)
PQ_DISTRIBUTE(T2 HASH HASH) */               t2.id     as t2_id
    , t2.filler as t2_filler             , t2.id2    as t2_id2
   , t3.id     as t3_id             , t3.filler as t3_filler
from               t1 t2             , t2 t3         where
 t3.id = t2.id (+)         and   regexp_replace(t3.filler,
'^([[:alnum:]]+)\s+$', lpad('\1', 10), 1, 1, 'c') =
regexp_replace(t2.filler (+), '^([[:alnum:]]+)\s+$', lpad('\1', 10), 1,
1, 'c')        ) v1      , t1 where        v1.t2_id2 = t1.id2 (+) +
2001 ) --where rownum > 1

Plan hash value: 1110592967

-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| Id  | Pid | Ord | Operation                               | Name     | Rows  | Bytes | Cost (%CPU)| Time     |    TQ  |IN-OUT| PQ Distrib | Start | Dur | Time Active Graph    | Parallel Distribution ASH                             | Parallel Distribution Graph ASH  | Activity Graph ASH  | Top 5 Activity ASH                                            |
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|   0 |     |  23 | SELECT STATEMENT                        |          |       |       |    32 (100)|          |        |      |            |       |     |                      |                                                       |                                  |                     |                                                               |
|   1 |   0 |  22 |  SORT AGGREGATE                         |          |     1 |  2145 |            |          |        |      |            |       |     |                      |                                                       |                                  |                     |                                                               |
|   2 |   1 |  21 |   PX COORDINATOR                        |          |       |       |            |          |        |      |            |    +1 |   1 |  @                   | 6-sqlplus.exe(1)                                      | 0                                |                     | PX Nsq: PQ load info query(1)                                 |
|   3 |   2 |  20 |    PX SEND QC (RANDOM)                  | :TQ10004 |     1 |  2145 |            |          |  Q1,04 | P->S | QC (RAND)  |       |     |                      |                                                       |                                  |                     |                                                               |
|   4 |   3 |  19 |     SORT AGGREGATE                      |          |     1 |  2145 |            |          |  Q1,04 | PCWP |            |   +20 |   8 |            @@@@      | 5-P007(2)                                             | 0                                |                     | ON CPU(2)                                                     |
|   5 |   4 |  18 |      VIEW                               |          |  2000K|  4091M|    32   (7)| 00:00:01 |  Q1,04 | PCWP |            |    +6 |  32 |    @@@@@@@@@@@@@@@@@ | 5-P007(28)                                            | 0000000                          | @@@                 | ON CPU(28)                                                    |
|*  6 |   5 |  17 |       HASH JOIN RIGHT OUTER             |          |  2000K|   288M|    32   (7)| 00:00:01 |  Q1,04 | PCWP |            |    +8 |   1 |     @                | 5-P007(1)                                             | 0                                |                     | ON CPU(1)                                                     |
|   7 |   6 |   4 |        PX RECEIVE                       |          |  2000 | 16000 |     2   (0)| 00:00:01 |  Q1,04 | PCWP |            |       |     |                      |                                                       |                                  |                     |                                                               |
|   8 |   7 |   3 |         PX SEND HASH                    | :TQ10002 |  2000 | 16000 |     2   (0)| 00:00:01 |  Q1,02 | P->P | HASH       |       |     |                      |                                                       |                                  |                     |                                                               |
|   9 |   8 |   2 |          PX BLOCK ITERATOR              |          |  2000 | 16000 |     2   (0)| 00:00:01 |  Q1,02 | PCWC |            |       |     |                      |                                                       |                                  |                     |                                                               |
|* 10 |   9 |   1 |           TABLE ACCESS STORAGE FULL     | T1       |  2000 | 16000 |     2   (0)| 00:00:01 |  Q1,02 | PCWP |            |       |     |                      |                                                       |                                  |                     |                                                               |
|  11 |   6 |  16 |        PX RECEIVE                       |          |  2000K|   272M|    29   (4)| 00:00:01 |  Q1,04 | PCWP |            |   +15 |   1 |         @            | 5-P007(1)                                             | 0                                |                     | ON CPU(1)                                                     |
|  12 |  11 |  15 |         PX SEND HASH                    | :TQ10003 |  2000K|   272M|    29   (4)| 00:00:01 |  Q1,03 | P->P | HASH       |       |     |                      |                                                       |                                  |                     |                                                               |
|  13 |  12 |  14 |          VIEW                           |          |  2000K|   272M|    29   (4)| 00:00:01 |  Q1,03 | PCWP |            |       |     |                      |                                                       |                                  |                     |                                                               |
|* 14 |  13 |  13 |           HASH JOIN RIGHT OUTER BUFFERED|          |  2000K|   411M|    29   (4)| 00:00:01 |  Q1,03 | PCWP |            |    +2 |  31 |  @@@@@@@@@@@@@@@@    | 5-P021(2),5-P031(2),6-P016(2),6-P031(2),5-P016(1),... | 0123456789ABCDEF0123456789A      | @@@                 | ON CPU(24),enq: XL - fault extent map(5),os thread startup(2) |
|  15 |  14 |   8 |            PX RECEIVE                   |          |  2000 |   212K|     2   (0)| 00:00:01 |  Q1,03 | PCWP |            |       |     |                      |                                                       |                                  |                     |                                                               |
|  16 |  15 |   7 |             PX SEND HASH                | :TQ10000 |  2000 |   212K|     2   (0)| 00:00:01 |  Q1,00 | P->P | HASH       |       |     |                      |                                                       |                                  |                     |                                                               |
|  17 |  16 |   6 |              PX BLOCK ITERATOR          |          |  2000 |   212K|     2   (0)| 00:00:01 |  Q1,00 | PCWC |            |       |     |                      |                                                       |                                  |                     |                                                               |
|* 18 |  17 |   5 |               TABLE ACCESS STORAGE FULL | T1       |  2000 |   212K|     2   (0)| 00:00:01 |  Q1,00 | PCWP |            |       |     |                      |                                                       |                                  |                     |                                                               |
|  19 |  14 |  12 |            PX RECEIVE                   |          |  2000K|   204M|    27   (4)| 00:00:01 |  Q1,03 | PCWP |            |       |     |                      |                                                       |                                  |                     |                                                               |
|  20 |  19 |  11 |             PX SEND HASH                | :TQ10001 |  2000K|   204M|    27   (4)| 00:00:01 |  Q1,01 | P->P | HASH       |    +2 |   4 |  @@                  | 5-P001(4),5-P002(4),5-P003(4),5-P004(4),5-P006(4),... | 0123456789ABCDEF0123456789ABCDEF | @@@@@@@@@@@@@       | ON CPU(125)                                                   |
|  21 |  20 |  10 |              PX BLOCK ITERATOR          |          |  2000K|   204M|    27   (4)| 00:00:01 |  Q1,01 | PCWC |            |       |     |                      |                                                       |                                  |                     |                                                               |
|* 22 |  21 |   9 |               TABLE ACCESS STORAGE FULL | T2       |  2000K|   204M|    27   (4)| 00:00:01 |  Q1,01 | PCWP |            |    +4 |   1 |   @                  | 5-P005(1)                                             | 0                                |                     | ON CPU(1)                                                     |
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Query Block Name / Object Alias (identified by operation id):
-------------------------------------------------------------

   1 - SEL$1
   5 - SEL$2 / from$_subquery$_001@SEL$1
   6 - SEL$2
  10 - SEL$2 / T1@SEL$2
  13 - SEL$3 / V1@SEL$2
  14 - SEL$3
  18 - SEL$3 / T2@SEL$3
  22 - SEL$3 / T3@SEL$3

Outline Data
-------------

  /*+
      BEGIN_OUTLINE_DATA
      IGNORE_OPTIM_EMBEDDED_HINTS
      OPTIMIZER_FEATURES_ENABLE('11.2.0.2')
      DB_VERSION('11.2.0.2')
      ALL_ROWS
      OUTLINE_LEAF(@"SEL$3")
      OUTLINE_LEAF(@"SEL$2")
      OUTLINE_LEAF(@"SEL$1")
      NO_ACCESS(@"SEL$1" "from$_subquery$_001"@"SEL$1")
      NO_ACCESS(@"SEL$2" "V1"@"SEL$2")
      FULL(@"SEL$2" "T1"@"SEL$2")
      LEADING(@"SEL$2" "V1"@"SEL$2" "T1"@"SEL$2")
      USE_HASH(@"SEL$2" "T1"@"SEL$2")
      PQ_DISTRIBUTE(@"SEL$2" "T1"@"SEL$2" HASH HASH)
      SWAP_JOIN_INPUTS(@"SEL$2" "T1"@"SEL$2")
      FULL(@"SEL$3" "T3"@"SEL$3")
      FULL(@"SEL$3" "T2"@"SEL$3")
      LEADING(@"SEL$3" "T3"@"SEL$3" "T2"@"SEL$3")
      USE_HASH(@"SEL$3" "T2"@"SEL$3")
      PQ_DISTRIBUTE(@"SEL$3" "T2"@"SEL$3" HASH HASH)
      SWAP_JOIN_INPUTS(@"SEL$3" "T2"@"SEL$3")
      END_OUTLINE_DATA
  */

Predicate Information (identified by operation id):
---------------------------------------------------

   6 - access("V1"."T2_ID2"="T1"."ID2"+2001)
  10 - storage(:Z>=:Z AND :Z<=:Z)
  14 - access("T3"."ID"="T2"."ID" AND  REGEXP_REPLACE ("T3"."FILLER",'^([[:alnum:]]+)\s+$','        \1',1,1,'c',)
  18 - storage(:Z>=:Z AND :Z<=:Z)
  22 - storage(:Z>=:Z AND :Z<=:Z)

Column Projection Information (identified by operation id):
-----------------------------------------------------------

   1 - (#keys=0) MAX()[22], MAX()[22], MAX()[22], MAX()[100], MAX()[100], MAX()[4000]
   2 - SYS_OP_MSR()[4280]
   3 - (#keys=0) SYS_OP_MSR()[4280]
   4 - (#keys=0) SYS_OP_MSR()[4280]
   5 - "T1_ID"[NUMBER,22], "T1_FILLER"[VARCHAR2,4000], "T2_ID"[NUMBER,22], "T2_FILLER"[VARCHAR2,100],
       "T3_ID"[NUMBER,22], "T3_FILLER"[VARCHAR2,100]
   6 - (#keys=1) "T1"."ID"[NUMBER,22], "V1"."T2_ID"[NUMBER,22], "V1"."T2_FILLER"[VARCHAR2,100],
       "T3_FILLER"[VARCHAR2,100], "V1"."T3_ID"[NUMBER,22]
   7 - "T1"."ID2"+2001[22], "T1"."ID"[NUMBER,22], "T1"."ID2"[NUMBER,22]
   8 - (#keys=1) "T1"."ID2"+2001[22], "T1"."ID"[NUMBER,22], "T1"."ID2"[NUMBER,22]
   9 - "T1"."ID"[NUMBER,22], "T1"."ID2"[NUMBER,22]
  10 - "T1"."ID"[NUMBER,22], "T1"."ID2"[NUMBER,22]
  11 - "V1"."T2_ID2"[NUMBER,22], "V1"."T2_ID"[NUMBER,22], "V1"."T2_FILLER"[VARCHAR2,100], "T3_FILLER"[VARCHAR2,100],
       "V1"."T3_ID"[NUMBER,22]
  12 - (#keys=1) "V1"."T2_ID2"[NUMBER,22], "V1"."T2_ID"[NUMBER,22], "V1"."T2_FILLER"[VARCHAR2,100],
       "T3_FILLER"[VARCHAR2,100], "V1"."T3_ID"[NUMBER,22]
  13 - "V1"."T2_ID"[NUMBER,22], "V1"."T2_FILLER"[VARCHAR2,100], "V1"."T2_ID2"[NUMBER,22], "V1"."T3_ID"[NUMBER,22],
       "T3_FILLER"[VARCHAR2,100]
  14 - (#keys=2) "T2"."ID"[NUMBER,22], "T3"."ID"[NUMBER,22], "T2"."FILLER"[VARCHAR2,100], "T2"."ID2"[NUMBER,22],
       "T3"."FILLER"[VARCHAR2,100]
  15 - "T2"."ID"[NUMBER,22],  REGEXP_REPLACE ("T2"."FILLER",'^([[:alnum:]]+)\s+$','        \1',1,1,'c',[4000], "T2"."FILLER"[VARCHAR2,100], "T2"."ID2"[NUMBER,22]
  16 - (#keys=2) "T2"."ID"[NUMBER,22],  REGEXP_REPLACE ("T2"."FILLER",'^([[:alnum:]]+)\s+$','        \1',1,1,'c',[4000], "T2"."FILLER"[VARCHAR2,100], "T2"."ID2"[NUMBER,22]
  17 - "T2"."ID"[NUMBER,22], "T2"."ID2"[NUMBER,22], "T2"."FILLER"[VARCHAR2,100]
  18 - "T2"."ID"[NUMBER,22], "T2"."ID2"[NUMBER,22], "T2"."FILLER"[VARCHAR2,100]
  19 - "T3"."ID"[NUMBER,22],  REGEXP_REPLACE ("T3"."FILLER",'^([[:alnum:]]+)\s+$','        \1',1,1,'c',[4000], "T3"."FILLER"[VARCHAR2,100]
  20 - (#keys=2) "T3"."ID"[NUMBER,22],  REGEXP_REPLACE ("T3"."FILLER",'^([[:alnum:]]+)\s+$','        \1',1,1,'c',[4000], "T3"."FILLER"[VARCHAR2,100]
  21 - "T3"."ID"[NUMBER,22], "T3"."FILLER"[VARCHAR2,100]
  22 - "T3"."ID"[NUMBER,22], "T3"."FILLER"[VARCHAR2,100]

This section is pretty much unchanged to the previous version and shows the execution plan (if available) along with the activity per execution plan line, as explained in the original post for version 1.0 of the script. Note that the script detects whether an execution plan is available or not and shows the activity per execution plan line in a different format if no execution plan could be found.

A note to RAC users: In versions prior to 11.2.0.2 the execution plan can only be pulled from the local instance - in worst case this execution plan is an incorrect one, since for the same SQL_ID and CHIlD_CURSOR different plans could be in the different Library Caches of the RAC instances.

From 11.2.0.2 on the correct execution plan will be pulled from the corresponding RAC instance by using an (undocumented) function that allows a "remote" instance execution of a query.

Experimental Stuff

There is a global switch _EXPERIMENTAL at the beginning of the configuration section.

By default this is disabled because the stuff shown could be called "unreliable" and potentially "misleading" information.

If you enable it by setting the configuration switch to an empty string, the I/O figures from the ASH data (only from 11.2+ on) will be shown at various places of the report. Note that this data is unreliable and usually falls short of the actual activity (I've never seen it reporting more than the actual activities). Since sometimes unreliable figures can be much better than nothing at all you can enable it in such cases where you want for example get an idea if the I/O was in the range of MBs or GBs - this is something you should be able to tell from the ASH data.

Likewise the average and median wait times from ASH will be shown at different places of the report if experimental is turned on.

It is important to understand what these wait times are: These are waits that were "in-flight", not completed when the sampling took place.

Doing statistical analysis based on such sampled, in-flight wait times is sometimes called "Bad ASH math", but again, if you know what you are doing and keep telling yourself what you're looking at, there might be cases where this information could be useful, for example, if you see that hundreds or thousands of those "in-flight" waits were sampled with a typical wait time of 0.5 secs (for example a multiblock read) where you expect a typical wait time of 0.005 secs. This might be an indication that something was broken or went wrong and could be worth further investigation.

This is what the affected sections look like with experimental turned on:

Concurrent Activity Summary (not this execution)

Concurrent Activity Summary (not this execution)
-----------------------------------------------

INSTANCE_ID|ACTIVITY                                          |ACTIVITY_CLASS      |AVG_TIM_WAIT_MS|MED_TIM_WAIT_MS|SAMPLE_COUNT|PERCENTAGE|ACTIVITY_GRAPH
-----------|--------------------------------------------------|--------------------|---------------|---------------|------------|----------|--------------------
          5|reliable message                                  |Other               |          978,8|           1001|           3|        30|@@@@@@
           |ON CPU                                            |ON CPU              |               |               |           2|        20|@@@@
           |SQL*Net break/reset to client                     |Application         |            102|            102|           1|        10|@@
          6|ASM file metadata operation                       |Other               |          350,6|          350,6|           1|        10|@@
           |enq: PV - syncstart                               |Other               |          259,2|          259,2|           1|        10|@@
           |control file parallel write                       |System I/O          |           92,1|           92,1|           1|        10|@@
           |ON CPU                                            |ON CPU              |               |               |           1|        10|@@

Note again that the wait times shown (average and median) are not true wait times since the wait was ongoing when the sample of the session was taken, which means that it wasn't completed yet, so the actual wait time for that wait will have been longer, and most of the waits won't be covered by the sampling anyway, so as already explained, you need to be very catious with that information.

Global I/O Summary based on ASH

Global I/O Summary based on ASH
-----------------------------------------------

          |TOTAL |TOTAL |READ  |WRITE |TOTAL |TOTAL |TOTAL |READ  |WRITE |IO    |AVG   |MEDIAN|AVG   |MEDIAN|
          |READ  |WRITE |IO    |IO    |READ  |WRITE |IO    |IO    |IO    |LAYER |READ  |READ  |WRITE |WRITE |CELL
DURATION  |IO    |IO    |REQS  |REQS  |IO    |IO    |LAYER |BYTES |BYTES |BYTES |REQ   |REQ   |REQ   |REQ   |OFFL
SECS      |REQS  |REQS  |PERSEC|PERSEC|BYTES |BYTES |BYTES |PERSEC|PERSEC|PERSEC|SIZE  |SIZE  |SIZE  |SIZE  |EFF
----------|------|------|------|------|------|------|------|------|------|------|------|------|------|------|-----
        38|   27 |   49 |    1 |    1 | 6857K|   12M|   32M|  180K|  327K|  835K|  254K|  254K|  254K|  254K| -64%




Global I/O Summary per Instance based on ASH
-----------------------------------------------

           |          |TOTAL |TOTAL |READ  |WRITE |TOTAL |TOTAL |TOTAL |READ  |WRITE |IO    |AVG   |MEDIAN|AVG   |MEDIAN|
           |          |READ  |WRITE |IO    |IO    |READ  |WRITE |IO    |IO    |IO    |LAYER |READ  |READ  |WRITE |WRITE |CELL
           |DURATION  |IO    |IO    |REQS  |REQS  |IO    |IO    |LAYER |BYTES |BYTES |BYTES |REQ   |REQ   |REQ   |REQ   |OFFL
INSTANCE_ID|SECS      |REQS  |REQS  |PERSEC|PERSEC|BYTES |BYTES |BYTES |PERSEC|PERSEC|PERSEC|SIZE  |SIZE  |SIZE  |SIZE  |EFF
-----------|----------|------|------|------|------|------|------|------|------|------|------|------|------|------|------|-----
          5|        38|    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |   0%
          6|        33|   27 |   49 |    1 |    1 | 6857K|   12M|   32M|  208K|  377K|  962K|  254K|  254K|  254K|  254K| -64%

This section, only available from 11.2 on, and only shown when the so called "experimental" mode is enabled (disabled by default, see the configuration section of the script).

From 11.2 on Oracle enriches the ASH data with accumulated statistics related to DB Time, CPU Time and I/O activity. This is a new approach since the data is not truly sampled, but accumulated from sample to sample, so in theory represents exact delta figures.

Note that this also means that the historic ASH data written to AWR (all samples every tenth second) requires these values to be aggregated for all samples in between that are not written to AWR in order to have meaningful information in these columns of the historic ASH data.

However, as it turns out, at least in 11.2, obviously not all I/O is covered by these statistics, for example I/O to the TEMP tablespace is not represented correctly and usually falls short of the actual I/O performed.

Furthermore there seem to be inconsistencies in the data that could indicate that it is not necessarily a reliable data source (the script to some extent attempts to detect such outliers and filter them out). Hence that information can be quite incorrect and therefore it is marked as "experimental". Nevertheless it can be much better than no I/O related information at all, therefore I decided to add it as a separate section.

Note that the I/O layer figures can be more than simply read plus write I/O, because these values include any software mirroring performed by Oracle via the ASM layer. So for example any write to ASM with ASM normal redundancy will be doubled in the I/O layer figures.

Please note furthermore that the Cell Offload Efficiency figure is only relevant to Exadata environments where the smart scan capabilities can reduce the actual amount of I/O. Of course you can easily end up with negative efficiency percentages if a lot of mirroring during writing takes place, or HCC compressed data gets uncompressed in the cells and sent to the compute nodes.

Parallel Slave activity overview based on ASH

Parallel Slave activity overview based on ASH
-----------------------------------------------

           |                                                                |          |                    |    SAMPLE|    SAMPLE|          |      |      |      |      |READ  |WRITE |      |      |IO    |READ  |WRITE |IO_LAY|AVG   |MEDIAN|AVG   |MEDIAN|TOP                                     |
           |                                                                |    SAMPLE|                    |     COUNT|     COUNT|   PERCENT|MAX   |MAX   |READ  |WRITE |REQ   |REQ   |READ  |WRITE |LAYER |BYTES |BYTES |BYTES |RE_REQ|RE_REQ|WR_REQ|WR_REQ|ACTIVE                                  |TOP
INSTANCE_ID|PROCESS                                                         |     COUNT|ACTIVITY_GRAPH      |       CPU|     OTHER|       CPU|PGA   |TEMP  |REQS  |REQS  |PERSEC|PERSEC|BYTES |BYTES |BYTES |PERSEC|PERSEC|PERSEC|SIZE  |SIZE  |SIZE  |SIZE  |PLAN LINES                              |ACTIVITIES
-----------|----------------------------------------------------------------|----------|--------------------|----------|----------|----------|------|------|------|------|------|------|------|------|------|------|------|------|------|------|------|------|----------------------------------------|----------------------------------------------------------------------
          5|5-P000                                                          |         3|                    |         3|         0|       100| 2026K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |20(3)                                   |ON CPU(3)
           |5-P001                                                          |         4|                    |         4|         0|       100| 2289K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |20(4)                                   |ON CPU(4)
           |5-P002                                                          |         4|                    |         4|         0|       100| 2140K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |20(4)                                   |ON CPU(4)
           |5-P003                                                          |         4|                    |         4|         0|       100| 2026K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |20(4)                                   |ON CPU(4)
           |5-P004                                                          |         4|                    |         4|         0|       100| 2026K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |20(4)                                   |ON CPU(4)
           |5-P005                                                          |         4|                    |         4|         0|       100| 2026K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |20(3),22(1)                             |ON CPU(4)
           |5-P006                                                          |         4|                    |         4|         0|       100| 2009K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |20(4)                                   |ON CPU(4)
           |5-P007                                                          |        36|@@@@                |        36|         0|       100| 4451K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |5(28),20(4),4(2),...                    |ON CPU(36)
           |5-P008                                                          |         4|                    |         4|         0|       100| 2026K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |20(4)                                   |ON CPU(4)
           |5-P009                                                          |         4|                    |         4|         0|       100| 2075K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |20(4)                                   |ON CPU(4)
           |5-P010                                                          |         4|                    |         4|         0|       100| 2026K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |20(4)                                   |ON CPU(4)
           |5-P011                                                          |         4|                    |         4|         0|       100| 2009K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |20(4)                                   |ON CPU(4)
           |5-P012                                                          |         4|                    |         4|         0|       100| 2009K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |20(4)                                   |ON CPU(4)
           |5-P013                                                          |         4|                    |         4|         0|       100| 2026K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |20(4)                                   |ON CPU(4)
           |5-P014                                                          |         4|                    |         4|         0|       100| 2009K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |20(4)                                   |ON CPU(4)
           |5-P015                                                          |         4|                    |         4|         0|       100| 2009K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |20(4)                                   |ON CPU(4)
           |5-P016                                                          |         1|                    |         1|         0|       100| 6286K| 1049K|    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |14(1)                                   |ON CPU(1)
           |5-P017                                                          |         1|                    |         1|         0|       100| 6286K| 1049K|    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |14(1)                                   |ON CPU(1)
           |5-P018                                                          |         1|                    |         1|         0|       100| 6286K| 1049K|    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |14(1)                                   |ON CPU(1)
           |5-P019                                                          |         1|                    |         1|         0|       100| 6221K| 1049K|    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |14(1)                                   |ON CPU(1)
           |5-P020                                                          |         1|                    |         0|         1|         0| 7007K| 1049K|    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |14(1)                                   |enq: XL - fault extent map(1)
           |5-P021                                                          |         2|                    |         2|         0|       100| 9170K| 3146K|    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |14(2)                                   |ON CPU(2)
           |5-P024                                                          |         1|                    |         1|         0|       100| 6221K| 1049K|    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |14(1)                                   |ON CPU(1)
           |5-P025                                                          |         1|                    |         1|         0|       100| 6680K| 1049K|    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |14(1)                                   |ON CPU(1)
           |5-P026                                                          |         1|                    |         0|         1|         0| 6352K| 1049K|    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |14(1)                                   |os thread startup(1)
           |5-P027                                                          |         1|                    |         1|         0|       100| 6221K| 1049K|    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |14(1)                                   |ON CPU(1)
           |5-P028                                                          |         1|                    |         1|         0|       100| 6221K| 1049K|    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |14(1)                                   |ON CPU(1)
           |5-P029                                                          |         1|                    |         1|         0|       100| 6286K| 1049K|    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |14(1)                                   |ON CPU(1)
           |5-P030                                                          |         1|                    |         1|         0|       100| 6221K| 1049K|    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |14(1)                                   |ON CPU(1)
           |5-P031                                                          |         2|                    |         2|         0|       100| 9956K| 3146K|    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |14(2)                                   |ON CPU(2)
          6|6-P000                                                          |         4|                    |         4|         0|       100| 2026K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |20(4)                                   |ON CPU(4)
           |6-P001                                                          |         4|                    |         4|         0|       100| 1961K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |20(4)                                   |ON CPU(4)
           |6-P002                                                          |         4|                    |         4|         0|       100| 1895K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |20(4)                                   |ON CPU(4)
           |6-P003                                                          |         3|                    |         3|         0|       100| 1961K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |20(3)                                   |ON CPU(3)
           |6-P004                                                          |         4|                    |         4|         0|       100| 2026K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |20(4)                                   |ON CPU(4)
           |6-P005                                                          |         4|                    |         4|         0|       100| 2026K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |20(4)                                   |ON CPU(4)
           |6-P006                                                          |         4|                    |         4|         0|       100| 2026K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |20(4)                                   |ON CPU(4)
           |6-P007                                                          |         4|                    |         4|         0|       100| 1961K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |20(4)                                   |ON CPU(4)
           |6-P008                                                          |         4|                    |         4|         0|       100| 1961K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |20(4)                                   |ON CPU(4)
           |6-P009                                                          |         4|                    |         4|         0|       100| 1961K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |20(4)                                   |ON CPU(4)
           |6-P010                                                          |         4|                    |         4|         0|       100| 2026K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |20(4)                                   |ON CPU(4)
           |6-P011                                                          |         4|                    |         4|         0|       100| 2026K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |20(4)                                   |ON CPU(4)
           |6-P012                                                          |         4|                    |         4|         0|       100| 1895K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |20(4)                                   |ON CPU(4)
           |6-P013                                                          |         4|                    |         4|         0|       100| 2026K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |20(4)                                   |ON CPU(4)
           |6-P014                                                          |         4|                    |         4|         0|       100| 2026K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |20(4)                                   |ON CPU(4)
           |6-P015                                                          |         4|                    |         4|         0|       100| 1961K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |20(4)                                   |ON CPU(4)
           |6-P016                                                          |         2|                    |         1|         1|        50| 8056K| 7340K|    0 |   18 |    0 |    9 |    0 | 4571K| 9142K|    0 | 2286K| 4571K|      |      |  254K|  254K|14(2)                                   |ON CPU(1),os thread startup(1)
           |6-P017                                                          |         1|                    |         0|         1|         0| 5107K| 1049K|    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |14(1)                                   |enq: XL - fault extent map(1)
           |6-P019                                                          |         1|                    |         1|         0|       100| 5107K| 1049K|    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |14(1)                                   |ON CPU(1)
           |6-P020                                                          |         1|                    |         1|         0|       100| 5107K| 1049K|    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |14(1)                                   |ON CPU(1)
           |6-P021                                                          |         1|                    |         1|         0|       100| 5172K| 1049K|    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |14(1)                                   |ON CPU(1)
           |6-P022                                                          |         1|                    |         0|         1|         0| 5107K| 1049K|    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |14(1)                                   |enq: XL - fault extent map(1)
           |6-P025                                                          |         1|                    |         1|         0|       100| 5107K| 1049K|    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |14(1)                                   |ON CPU(1)
           |6-P026                                                          |         1|                    |         1|         0|       100| 5172K| 1049K|    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |14(1)                                   |ON CPU(1)
           |6-P027                                                          |         1|                    |         1|         0|       100| 5107K| 1049K|    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |14(1)                                   |ON CPU(1)
           |6-P028                                                          |         1|                    |         0|         1|         0| 5172K| 1049K|    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |14(1)                                   |enq: XL - fault extent map(1)
           |6-P029                                                          |         1|                    |         0|         1|         0| 5172K| 1049K|    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |14(1)                                   |enq: XL - fault extent map(1)
           |6-P030                                                          |         1|                    |         1|         0|       100| 5172K| 1049K|    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |14(1)                                   |ON CPU(1)
           |6-P031                                                          |         2|                    |         2|         0|       100| 7007K| 8389K|   27 |   31 |   14 |   16 | 6857K| 7873K|   23M| 3428K| 3936K|   11M|  254K|  254K|  254K|  254K|14(2)                                   |ON CPU(2)
           |6-sqlplus.exe                                                   |         1|                    |         0|         1|         0| 1699K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |2(1)                                    |PX Nsq: PQ load info query(1)

If on 11.2 and the already explained "experimental" mode is enabled this will also include the (possibly unreliable) I/O figures per process.

Activity Class Summary

Activity Class Summary
-----------------------------------------------

ACTIVITY_CLASS      |AVG_TIM_WAIT_MS|MED_TIM_WAIT_MS|SAMPLE_COUNT|PERCENTAGE|ACTIVITY_GRAPH
--------------------|---------------|---------------|------------|----------|--------------------
ON CPU              |               |               |         182|        96|@@@@@@@@@@@@@@@@@@@
Other               |          373,6|          392,7|           6|         3|@
Concurrency         |          358,9|          358,9|           2|         1|




Activity Class Summary per Instance
-----------------------------------------------

INSTANCE_ID|ACTIVITY_CLASS      |AVG_TIM_WAIT_MS|MED_TIM_WAIT_MS|SAMPLE_COUNT|PERCENTAGE|ACTIVITY_GRAPH
-----------|--------------------|---------------|---------------|------------|----------|--------------------
          5|ON CPU              |               |               |         109|        57|@@@@@@@@@@@
           |Other               |          461,7|          461,7|           1|         1|
           |Concurrency         |            382|            382|           1|         1|
          6|ON CPU              |               |               |          73|        38|@@@@@@@@
           |Other               |          355,9|          347,7|           5|         3|@
           |Concurrency         |          335,8|          335,8|           1|         1|

Note that the same applies as above - the average and median wait times shown are not true wait times and therefore shouldn't be taken as such - these are sampled, "in-flight" waits not completed yet.

Activity Summary

Activity Summary
-----------------------------------------------

ACTIVITY                                          |ACTIVITY_CLASS      |AVG_TIM_WAIT_MS|MED_TIM_WAIT_MS|SAMPLE_COUNT|PERCENTAGE|ACTIVITY_GRAPH
--------------------------------------------------|--------------------|---------------|---------------|------------|----------|--------------------
ON CPU                                            |ON CPU              |               |               |         182|        96|@@@@@@@@@@@@@@@@@@@
enq: XL - fault extent map                        |Other               |            408|          437,7|           5|         3|@
os thread startup                                 |Concurrency         |          358,9|          358,9|           2|         1|
PX Nsq: PQ load info query                        |Other               |          201,3|          201,3|           1|         1|




Activity Summary per Instance
-----------------------------------------------

INSTANCE_ID|ACTIVITY                                          |ACTIVITY_CLASS      |AVG_TIM_WAIT_MS|MED_TIM_WAIT_MS|SAMPLE_COUNT|PERCENTAGE|ACTIVITY_GRAPH
-----------|--------------------------------------------------|--------------------|---------------|---------------|------------|----------|--------------------
          5|ON CPU                                            |ON CPU              |               |               |         109|        57|@@@@@@@@@@@
           |os thread startup                                 |Concurrency         |            382|            382|           1|         1|
           |enq: XL - fault extent map                        |Other               |          461,7|          461,7|           1|         1|
          6|ON CPU                                            |ON CPU              |               |               |          73|        38|@@@@@@@@
           |enq: XL - fault extent map                        |Other               |          394,6|          392,7|           4|         2|
           |os thread startup                                 |Concurrency         |          335,8|          335,8|           1|         1|
           |PX Nsq: PQ load info query                        |Other               |          201,3|          201,3|           1|         1|

Same as above, at activity granularity.

Activity Timeline based on ASH

Activity Timeline based on ASH
-----------------------------------------------

           |             |      |      |      |      |READ  |WRITE |      |      |IO    |READ  |WRITE |IO_LAY|AVG   |MEDIAN|AVG   |MEDIAN|          |          |   AVERAGE|TOP                                     |                                                                      |                                                            |AVERAGE
           |             |      |      |READ  |WRITE |REQ   |REQ   |READ  |WRITE |LAYER |BYTES |BYTES |BYTES |RE_REQ|RE_REQ|WR_REQ|WR_REQ|          |          |    ACTIVE|ACTIVE                                  |TOP                                                                   |TOP                                                         |ACTIVE SESSIONS
INSTANCE_ID|DURATION_SECS|PGA   |TEMP  |REQS  |REQS  |PERSEC|PERSEC|BYTES |BYTES |BYTES |PERSEC|PERSEC|PERSEC|SIZE  |SIZE  |SIZE  |SIZE  |       CPU|     OTHER|  SESSIONS|PLAN LINES                              |ACTIVITIES                                                            |PROCESSES                                                   |GRAPH
-----------|-------------|------|------|------|------|------|------|------|------|------|------|------|------|------|------|------|------|----------|----------|----------|----------------------------------------|----------------------------------------------------------------------|------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
          5|            1|      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          6              |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|            2|      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          6              | 1699K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |         0|         1|         1|2(1)                                    |PX Nsq: PQ load info query(1)                                         |6-sqlplus.exe(1)                                            |*
          5|            3|  122M|   15M|    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |        28|         2|        30|20(16),14(14)                           |ON CPU(28),enq: XL - fault extent map(1),os thread startup(1)         |5-P000(1),5-P001(1),5-P002(1),5-P003(1),5-P004(1),...       |@@@@@@@@@@@@@@@@@@@@@@@@@@@@**
          6              |   99M|   14M|    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |        24|         5|        29|20(16),14(13)                           |ON CPU(24),enq: XL - fault extent map(4),os thread startup(1)         |6-P000(1),6-P001(1),6-P002(1),6-P003(1),6-P004(1),...       |@@@@@@@@@@@@@@@@@@@@@@@@*****
          5|            4|   50M| 6291K|    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |        17|         0|        17|20(15),14(2)                            |ON CPU(17)                                                            |5-P001(1),5-P002(1),5-P003(1),5-P004(1),5-P005(1),...       |@@@@@@@@@@@@@@@@@
          6              |   32M|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |        16|         0|        16|20(16)                                  |ON CPU(16)                                                            |6-P000(1),6-P001(1),6-P002(1),6-P003(1),6-P004(1),...       |@@@@@@@@@@@@@@@@
          5|            5|   33M|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |        16|         0|        16|20(15),22(1)                            |ON CPU(16)                                                            |5-P000(1),5-P001(1),5-P002(1),5-P003(1),5-P004(1),...       |@@@@@@@@@@@@@@@@
          6              |   32M|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |        16|         0|        16|20(16)                                  |ON CPU(16)                                                            |6-P000(1),6-P001(1),6-P002(1),6-P003(1),6-P004(1),...       |@@@@@@@@@@@@@@@@
          5|            6|   33M|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |        16|         0|        16|20(16)                                  |ON CPU(16)                                                            |5-P000(1),5-P001(1),5-P002(1),5-P003(1),5-P004(1),...       |@@@@@@@@@@@@@@@@
          6              |   38M| 7340K|    0 |   18 |    0 |   18 |    0 | 4571K| 9142K|    0 | 4571K| 9142K|      |      |  254K|  254K|        16|         0|        16|20(15),14(1)                            |ON CPU(16)                                                            |6-P000(1),6-P001(1),6-P002(1),6-P004(1),6-P005(1),...       |@@@@@@@@@@@@@@@@
          5|            7| 4451K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|            8| 4451K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|            9| 4451K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |         1|         0|         1|6(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           10| 4451K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           11| 4451K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           12| 4451K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           13| 4451K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           14| 4451K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           15| 4451K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           16| 4451K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |         1|         0|         1|11(1)                                   |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           17| 4451K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           18| 4451K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           19| 4451K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           20| 4451K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           21| 4451K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |         1|         0|         1|4(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           22| 4451K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           23| 4451K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           24| 4451K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           25| 4451K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           26| 4451K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           27| 4451K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           28| 4451K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |         1|         0|         1|4(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           29| 4451K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           30| 4451K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           31| 4451K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           32| 4451K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           33| 4451K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              | 7007K| 8389K|   27 |   31 |   27 |   31 | 6857K| 7873K|   23M| 6857K| 7873K|   23M|  254K|  254K|  254K|  254K|         1|         0|         1|14(1)                                   |ON CPU(1)                                                             |6-P031(1)                                                   |@
          5|           34| 4451K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           35| 4451K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           36| 4451K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           37| 4451K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |         0|         0|         0|                                        |                                                                      |                                                            |
          5|           38| 4386K|      |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |    0 |      |      |      |      |         1|         0|         1|5(1)                                    |ON CPU(1)                                                             |5-P007(1)                                                   |@
          6              |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |      |         0|         0|         0|                                        |                                                                      |                                                            |

From 11.2 on, and if the "experimental" mode is enabled (as explained above already), the I/O figures per bucket will also be shown. Although not part of the experimental stuff, please note that in particular the TEMP figures have turned out not to be very reliable, furthermore short peaks in PGA / TEMP usage are not well represented in the ASH data.

Pages

Wednesday, June 29, 2016

Monday, December 28, 2015

Thursday, January 22, 2015

Sunday, January 11, 2015

Sunday, December 21, 2014

Sunday, June 29, 2014

Saturday, March 29, 2014

Monday, December 2, 2013

Wednesday, May 8, 2013

Wednesday, October 24, 2012

Summary Of Changes

10.2 Support

Short Introduction

Section Overview For Version 2.0

General Information

Global ASH Summary

Global ASH Summary for concurrent activity

Concurrent Activity Summary (not this execution)

Information on Parallel Degree based on ASH

Parallel Slave activity overview based on ASH

Activity Class Summary

Activity Summary

Activity Timeline based on ASH

Activity on execution plan line level

Experimental Stuff

Concurrent Activity Summary (not this execution)

Global I/O Summary based on ASH

Parallel Slave activity overview based on ASH

Activity Class Summary

Activity Summary

Activity Timeline based on ASH

Blog Archive

Homepage

YouTube Channel

About Me

Contact Details

OakTable Book "Expert Oracle Practices"

Blogroll