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Don Burleson Blog 







Oracle RAC CRS Services

Expert Oracle Database Tips by Donald BurlesonFebruary 9, 2015

Question: I have an Oracle 2-node RAC running on Linux OS version Redhat 4. When the Cluster Ready Services (CRS) start, all the services are online.  The problem is that when I try to connect the database, it is connecting to idle instance.

 A detail check indicates that the processes all get started, but the instance is not.

I have tried  stopping the background processes and starting the instance manually using SQL*Plus, and the DB instance started and I can connect.

But when I check the crs service status using crs_stat -t, the instance and service status are offline, nodeapps services are online. Attempting a restart using crs_start results in an error.

Does anyone have any ideas on what else I can try?

Answer:  If Clusterware is not automatically starting your database and it is showing an idle instance, it could be that your ORACLE_HOME is not set properly in the cluster configuration.

You can use srvctl to drop and re-add the database from cluster services to ensure everything is set up properly for the DB and instances.

You can use crs_stat -p to get the profile of any RAC resource.

If the ORACLE_HOME is not the issue, I would suggest looking at your Clusterware logs in $ORA_CRS_HOME/log/nodename, specifically those in the racg subdirectory.

An overview of building your own RAC cluster properly is available here

Additional information on RAC CRS is available here.

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See working examples of Oracle Grid and RAC in the book Oracle Grid and Real Application Clusters.

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