My Oracle Support Banner

Wrong Parallel Query Result (Doc ID 1345433.1)

Last updated on FEBRUARY 19, 2019

Applies to:

Oracle Database - Enterprise Edition - Version 11.1.0.6 to 11.2.0.2 [Release 11.1 to 11.2]
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Backup Service - Version N/A and later
Information in this document applies to any platform.

Symptoms

A query without any hints returns 919,312 rows. However, when a parallel hint is added, the query returns a lesser number of rows. Serial execution returns the correct number of rows.

When setting these hidden parameters, then wrong numbers are reporting as well:


Basically, the parallel statement might return wrong results when joining views containing
order by or group by on the join columns.

Cause

To view full details, sign in with your My Oracle Support account.

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


In this Document
Symptoms
Cause
Solution
References


My Oracle Support provides customers with access to over a million knowledge articles and a vibrant support community of peers and Oracle experts.