High Waits On cursor: mutex X After Upgrading The Database to 12c, 18c & 19c
(Doc ID 2625815.1)
Last updated on JANUARY 07, 2020
Oracle Database - Enterprise Edition - Version 220.127.116.11 to 18.104.22.168.0 [Release 12.1 to 18]
Information in this document applies to any platform.
- High waits on cursor: mutex X after upgrading the database to 22.214.171.124, 126.96.36.199, 18c or 19c.
- CPU utilization spikes to 100% due to the mutex waits leading to database hang or application outage.
- Huge version count is seen for the SQL statements during the problem period.
- Login or connection storm is observed during the problem.
- Huge sleeps on functions kkscsAddChildNode & kkscsPruneChild as per 'Mutex Sleep Summary' from AWR report.
Upgrading the database to 12c and higher.
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