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Troubleshooting: Waits for Mutex Type Events (Doc ID 1377998.1)

Last updated on FEBRUARY 12, 2019

Applies to:

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
Oracle Database Backup Service - Version N/A and later
Information in this document applies to any platform.

Purpose

The purpose of the note is to help troubleshoot mutex waits.

Troubleshooting Steps

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In this Document
Purpose
Troubleshooting Steps
 Mutex Event Waits
 How to Identify Mutex Event Waits.
 Diagnosing Potential Causes using AWR Report
 Load Profile
 Increased Parse Counts
 Mutex Sleeps
 Database Appears 'Hung'
 Documents with Suggestions on How to Diagnose Specific Waits
 Potential Solutions
 Use Recommended Patch Levels
 Reduce Parsing
 High Version Counts
 CURSOR_SHARING=SIMILAR
 OS Resources
 Size the Shared Pool Correctly
 Known Issues
 11.2.0.X
 11.1.0.7.X
 Further Details on Specific Mutex Wait Events
 Troubleshooting Other Issues
References

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