Deinstalling RAC Software 11gR2 and later

1. Deinstall rac database :

cd $ORACLE_HOME/deinstall
./deinstall

2. Verify the status of the cluster and observe that the database is not available as resource in clusterware.

crsctl status res -t

3. Now login to grid ORACLE_HOME and deinstall rac clusterware.

. oraenv
+ASM1
cd $ORACLE_HOME/deinstall/
./deinstall

https://hiteshgondalia.wordpress.com/2012/11/26/how-to-manually-drop-database-in-oracle-rac-environment/
http://www.askmlabs.com/2014/03/uninstallingdeinstalling-rac-software.html

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