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Waits for 'Enq: TX - ...' Type Events - Transaction (TX) Lock Example Scenarios (Doc ID 62354.1)

Last updated on JUNE 03, 2020

Applies to:

Oracle Database - Personal Edition - Version 7.3.4.0 and later
Oracle Database - Enterprise Edition - Version 7.3.4.0 and later
Oracle Database - Standard Edition - Version 7.3.4.0 and later
Oracle Database Cloud Schema 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.

Purpose

This document provides examples of TX locks and the waits which can occur in various circumstances. Often such waits will go unnoticed unless they are of a long duration or when they trigger a deadlock scenario (which raises an ORA-60 error).

The examples here demonstrate fundamental locking scenarios which should be understood by application developers and DBA's alike.

The examples require select privilege on the V$ views.

Troubleshooting Steps

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