Undo Related Wait Events & Known Issues
(Doc ID 1575701.1)
Last updated on SEPTEMBER 04, 2023
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
Gen 1 Exadata Cloud at Customer (Oracle Exadata Database 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.
Purpose
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
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 |