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Oracle Linux: System Slowness caused by Tasks Blocking on rds_ib_flush_mr_pool (Doc ID 2734207.1)

Last updated on FEBRUARY 25, 2021

Applies to:

Linux OS - Version Oracle Linux 7.8 with Unbreakable Enterprise Kernel [4.14.35] and later
Linux x86-64

Symptoms

System running is slow and Oracle tasks are found to be blocked on rds_ib_flush_mr_pool wait channel when listing through ps command. Oracle Database is running slowly with huge file log sync activities.

The following symptoms would be

Top performance data shows

 

Changes

 After kernel upgrade to 4.14.35-1902.303.5.2.el7uek.x86_64 version. This would happen when Exadata version is upgraded from 19.2.4 to 19.3.10

Cause

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In this Document
Symptoms
Changes
Cause
Solution
References


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