Monday, June 23, 2014

Parallel Execution Skew - Addressing Skew Using Manual Rewrites

This is just a short note that the next part of the mini series about Parallel Execution skew has been published at AllThingsOracle.com.

After having shown in the previous instalment of the series that Oracle 12c added a new feature that can deal with Parallel Execution skew (at present in a limited number of scenarios) I now demonstrate in that part how the problem can be addressed using manual query rewrites, in particular the probably not so commonly known technique of redistributing popular values using an additional re-mapping table.

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