DBMS_PARALLEL_EXECUTE Is Not Distributing The Chunks Uniformly Resulting In Performance Issue. (Doc ID 1916579.1)

Last updated on JULY 31, 2017

Applies to:

PL/SQL - Version 11.2.0.4 to 12.2.0.1 [Release 11.2 to 12.2]
Information in this document applies to any platform.
*** Checked for relevance on 31st Jul 2017 ***

Symptoms

In 11.2.0.4.0 database version, the performance of the DBMS_PARALLEL_EXECUTE package has degraded slightly when compared to earlier releases and most chunks ended up being processed by a single job irrespective of the degree of parallelism specified.

Changes

Either database was upgraded to 11.2.0.4.0 release or it is a new 11.2.0.4.0 installation. 

Cause

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