Enqueue TM Contention When Executing Online DBMS_REDEFINITION For a Partitioned Table (Doc ID 2212678.1)

Last updated on DECEMBER 09, 2016

Applies to:

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

Symptoms

Getting an enqueue contention 'enq: TM - contention' when executing this online dbms_redefinition in a partitioned table.

This procedure works fine in stand alone, but when there is INSERT rows in the parent table, a lock is generated, and the new session remains waiting.

Sessions are waiting with event: "enq: TM - contention".

Changes

 Using dbms_redefinition in a partitioned table.

Cause

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