High SYS CPU Usage ON LMS Thread (SCMN/CR00/RS01) During High Workload
(Doc ID 2707048.1)
Last updated on SEPTEMBER 03, 2020
Applies to:Oracle Database - Enterprise Edition - Version 184.108.40.206 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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