Enqueue TM Contention When Executing Online DBMS_REDEFINITION For a Table Partitioned By REFERENCE
(Doc ID 2212678.1)
Last updated on JUNE 22, 2022
Applies to:
Oracle Cloud Infrastructure - Database Service - Version N/A and laterOracle Database Backup Service - Version N/A and later
Oracle Database Cloud Exadata Service - Version N/A and later
Oracle Database Cloud Service - Version N/A and later
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.
Symptoms
Getting an enqueue contention 'enq: TM - contention' when executing this online dbms_redefinition in a table partitioned by REFERENCE.
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 partition by REFERENCE table.
Cause
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In this Document
| Symptoms |
| Changes |
| Cause |
| Solution |
| References |