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Performance Issues With Parallel Queries And TEMP TABLE TRANSFORMATION (Doc ID 1633759.1)

Last updated on AUGUST 04, 2018

Applies to:

Oracle Database - Enterprise Edition - Version 11.2.0.3 and later
Information in this document applies to any platform.

Symptoms

Statements running in parallel can take significant time compare to the run in serial.
Parallel run does not complete for 20 minutes whereas the same statements when run after disabling parallel will complete in 20-30 seconds.

The Plan Table shows usage of Temp table transformation during load


pstack of the parallel process shows the below kcbrbo and qertbFetch

Cause

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