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Undo Related Wait Events & Known Issues (Doc ID 1575701.1)

Last updated on APRIL 09, 2020

Applies to:

Oracle Database - Enterprise Edition - Version 9.2.0.8 to 11.2.0.4 [Release 9.2 to 11.2]
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Information in this document applies to any platform.
***Checked for relevance on 24-Aug-2017***

Purpose

Below is the most commonly seen Undo related wait events. This document will help how to diagnose the troubleshoot the same

 

Troubleshooting Steps

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In this Document
Purpose
Troubleshooting Steps
 Enq: US Contention:
 Buffer Busy Waits on Undo
 Buffer Busy Waits:
 wait for a undo record
References

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