Why Is the Sql Running in Parallel? (Doc ID 1627599.1)

Last updated on MARCH 27, 2014

Applies to:

Oracle Database - Enterprise Edition - Version 11.2.0.4 to 11.2.0.4 [Release 11.2]
Information in this document applies to any platform.

Goal

What is the reason for which a statement is executed in parallel even so all the conditions of having this in serial are met?

The degree for all the tables involved is set to 1

and

parallel_degree_limit      CPU         
parallel_degree_policy     MANUAL

Much more even when setting:

ALTER SESSION DISABLE PARALLEL DML;
ALTER SESSION DISABLE PARALLEL DDL;
ALTER SESSION DISABLE PARALLEL QUERY;


the statement is still executed in parallel.
 

Solution

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