Performance Issues With Parallel Queries And TEMP TABLE TRANSFORMATION
(Doc ID 1633759.1)
Last updated on FEBRUARY 01, 2022
Applies to:Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Database Cloud Exadata Service - Version N/A and later
Oracle Database Backup Service - Version N/A and later
Information in this document applies to any platform.
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
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