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Services are Running on Wrong RAC Instances (Doc ID 965385.1)

Last updated on SEPTEMBER 09, 2019

Applies to:

Oracle Database - Enterprise Edition - Version 10.1.0.2 to 10.2.0.4 [Release 10.1 to 10.2]
Oracle Database Cloud Schema 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
Oracle Database Exadata Express Cloud Service - Version N/A and later
Information in this document applies to any platform.

Symptoms

On a 4 node RAC cluster, database services are running on the wrong instances after instance restart.

Consider the following service configuration:

$ srvctl config service -d <DATABASE_NAME1>
<DATABASE_NAME3> PREF: <INSTANCE1> <INSTANCE2> AVAIL: <INSTANCE3> <INSTANCE4>
<DATABASE_NAME2> PREF: <INSTANCE2> AVAIL: <INSTANCE1>

The service '<DATABASE_NAME2>' was running on all 4 instances when it should have been running on instance 2 (<INSTANCE2>) only.

This caused user sessions to be connected to the wrong instances, leading to load problems.

The same happened for another service (<DATABASE_NAME3>).

Changes

All instances had been restarted during maintenance window.

Cause

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In this Document
Symptoms
Changes
Cause
Solution


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