RHEL6 CFS Scheduler can Cause High Latch Waits for 'latch: cache buffers chains'
(Doc ID 1560594.1)
Last updated on FEBRUARY 21, 2019
Applies to:Oracle Database - Enterprise Edition - Version 18.104.22.168 and later
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Express Cloud 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
- After upgrade from RHEL5 / OEL5 (i.e. 2.6.18 kernel versions) to RHEL6 / OL6 (i.e. 2.6.32 or higher kernel versions including UEK)
or any other newer Linux distribution which features the CFS scheduler it is observed that jobs/queries having a large number of
waits for 'latch: cache buffers chains' perform more slowly than before.
- The total elapsed time is increased with no other AWR statistics evidence except a minor increase in latch waits which indicates that waits for CPU are occurring.
Upgrading from Linux 2.6.18 kernel versions to 2.6.32 or higher kernel versions without any hardware or Oracle database changes.
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