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Top 11 Things to do NOW to Stabilize your RAC Cluster Environment (Doc ID 1344678.1)

Last updated on AUGUST 28, 2023

Applies to:

Oracle Database - Enterprise Edition - Version and later
Gen 1 Exadata Cloud at Customer (Oracle Exadata Database Cloud Machine) - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Database Cloud Exadata Service - Version N/A and later
Information in this document applies to any platform.


Many RAC instability issues are attributed to a rather short list of commonly missed Best Practices and/or Configuration issues.  The goal of this document it to provide a easy to find listing of these commonly missed Best Practices and/or Configuration issues with the hope to prevent instability caused by these issues.


This article applies to ALL RAC implementations.


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In this Document
 1.  Apply the latest Patchset Update (PSU) to your environment
 2.  Ensure that UDP buffers are sized appropriately
 3.  Set DIAGWAIT to a value of 13 on all 10.2 and 11.1 Clusters
 4.  Implement HugePages on Linux Environments
 5.  Implement OS Watcher and/or Cluster Health Monitor
 6.  Follow Best Practices for OS settings
 7.  Ensure appropriate APARS are in place on AIX platforms to avoid Excessive paging/swapping issues
 8.  Apply NUMA Patch
 9.  Increase the Windows noninteractive Desktop Heap
 10.  Run ORAchk utility
 11. Implement NTP with slewing option

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