Exadata: NUMA enabled Compute nodes may experience high load and outages due to OS fragmentation issues.
(Doc ID 2628921.1)
Last updated on JULY 28, 2020
Applies to:Oracle Exadata Storage Server Software - Version 18.104.22.168.0 and later
Information in this document applies to any platform.
Due to high fragmentation at the Linux OS level, Exadata DB nodes (both bare metal or virtual) may experience sharp increase in load with large number of processes get into D (Uninterruptible Sleep) state, resulting in stability issues.
The symptoms include:
- DB Node outage due to evictions or Kernel panics.
- ASM/DB instance crashes
- Severe Database performance issues.
To determine if the database nodes has NUMA enabled.
If it still cannot find an order-3 chunk, it will retry again until succeeds. This can cause contention on the resources held by the compacting processes resulting high load averages and subsequent issues.
Upgrade the RDBMS to 12.2 or higher releases.
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