Query returns wrong results with parallel and hash join used

(Doc ID 1553518.1)

Last updated on JANUARY 18, 2017

Applies to:

Oracle Database - Enterprise Edition - Version 11.1.0.7 to 11.2.0.1 [Release 11.1 to 11.2]
Oracle Database - Enterprise Edition - Version 10.2.0.1 to 10.2.0.4 [Release 10.2]
Information in this document applies to any platform.

Symptoms

After a DB upgrade from 10g to 11g, the following problem started:

1) The same SQL returns different results each time its run.

2) The execution plan is the same with each run.

2) The query is parallel, and the SQL has outer join syntax.

3) When parallel query is disabled, the result is always correct.

Changes

 Database upgrade from 10g to 11g.

Cause

Sign In with your My Oracle Support account

Don't have a My Oracle Support account? Click to get started

My Oracle Support provides customers with access to over a
Million Knowledge Articles and hundreds of Community platforms