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Resolving Issues Where 'enq: TM - contention' Waits are Occurring (Doc ID 1905174.1)

Last updated on DECEMBER 27, 2023

Applies to:

Oracle Database - Enterprise Edition - Version and later
Gen 1 Exadata Cloud at Customer (Oracle Exadata Database Cloud Machine) - Version N/A and later
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Information in this document applies to any platform.


Disclaimer: This note is written in the context that the Performance Guided Resolution tool was used and recommended this article. It may not make as much sense if read standalone or by other audiences.

Troubleshooting Steps

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In this Document
Troubleshooting Steps
 Brief Definition:
 Problem Confirmation:
 Troubleshooting 'enq: TM - contention'  waits
 Potential Causes:
 Missing Foreign Key (FK) index on the FK constraint columns in the Child tables
 Parallel DML
 Measuring Success

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