Degree Of Parallelism Downgrade 100%

(Doc ID 1900231.1)

Last updated on MAY 21, 2018

Applies to:

Oracle Database - Enterprise Edition - Version 11.2.0.4 and later
Information in this document applies to any platform.

Symptoms

On production database exadata 4 nodes 11.2.0.4 version,

ACTUAL BEHAVIOR
---------------
Quite many of the parallel operations are downgraded to serial even so the plan produced is parallel. No slaves are created at all.

EXPECTED BEHAVIOR
-----------------------
the statement to be executed in parallel

Changes

 

Cause

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