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Instance hang with very high wait on 'cursor: mutex S' (Doc ID 1274320.1)

Last updated on JANUARY 09, 2023

Applies to:

Oracle Database - Enterprise Edition - Version 11.1.0.6 and later
Oracle Database Cloud Schema 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 Exadata Express Cloud Service - Version N/A and later
Information in this document applies to any platform.

Symptoms

2 node RAC, intermittently instance is slow then go into 'hang' status without accepting any new connections. There is very high wait of 'cursor: mutex S'.

AWR report during slow/hanging period shows:

Changes

 

Cause

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In this Document
Symptoms
Changes
Cause
Solution
References


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