High SYS CPU Usage ON LMS Thread (SCMN/CR00/RS01) During High Workload
(Doc ID 2707048.1)
Last updated on MAY 25, 2021
Applies to:Oracle Database - Enterprise Edition - Version 188.8.131.52 and later
Information in this document applies to any platform.
ON 6-node 19.5 RAC On Red Hat Enterprise 7, it's observed that high SYS CPU is utilized by lms/scmn process/thread during high workload. for example, the issue can be reproduces by below test:
- Start parallel recovery(as it is a standby DB).
- At the same time, execute a full database backup using rman on the standby.
The issue not only happens on standby, it can also happen on primary or any other RAC environments during high workload.
High sys CPU can be observed on LMS/SCMN from top command.
No changes, new created environment.
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