Undo Related Wait Events & Known Issues
(Doc ID 1575701.1)
Last updated on APRIL 09, 2020
Applies to:Oracle Database - Enterprise Edition - Version 184.108.40.206 to 220.127.116.11 [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***
Below is the most commonly seen Undo related wait events. This document will help how to diagnose the troubleshoot the same
- Enq: US Contention
- Buffer Busy waits on Undo
- Wait for a undo record
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In this Document
|Enq: US Contention:|
|Buffer Busy Waits on Undo|
|Buffer Busy Waits:|
|wait for a undo record|