Incorrect Computed Degree of Parallelism Using Auto DOP
(Doc ID 2683523.1)
Last updated on JULY 20, 2024
Applies to:
Oracle Database - Enterprise Edition - Version 11.2.0.4 to 19.1.0.0.0 [Release 11.2 to 19]
Information in this document applies to any platform.
Symptoms
- SELECT statements executed with PARALLEL hint without forcing DOP like /*+ PARALLEL */ runs with only 1 or 2 degree of parallelism.
- When SELECT is executed with forcing DOP like /*+ PARALLEL(16) */ , it runs with 16 degree of parallelism.
- There are enough CPU cores available and there is no heavy load in the system.
- Parallel settings are appropriate.
- The same SELECT statements run fine in other environment.
Changes
Computed DOP is 1 when PARALLEL hint used w/o forcing degree:
Cause
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