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Removing a NODE from RAC

You can delete the instance by using the database creation assistant (DBCA), invoke the

program choose the RAC database, choose instance management and then choose

delete instance, enter the sysdba user and password then choose the instance to delete.

To clean up ASM follow the below steps

From node 1 run the below command to stop ASM on the node to be removed

srvctl stop asm -n rac3
srvctl remove asm -n rac3
Now run the following on the node to be removed

  cd $ORACLE_HOME/admin
  rm -rf +ASM
  cd $ORACLE_HOME/dbs
  rm -f *ASM*
Check that /etc/oratab file has no ASM entries, if so remove them

Now remove the listener for the node to be removed

· Login as user oracle, and set your DISPLAY environment variable, then start the Network

Configuration Assistant
$ORACLE_HOME/bin/netca

· Choose cluster management

· Choose listener

· Choose Remove

· Choose the name as LISTENER

Next we remove the node from the database

Run the below script from the node to be removed
cd $ORACLE_HOME/bin
./runInstaller -updateNodeList ORACLE_HOME=$ORACLE_HOME "CLUSTER_NODES={rac3}" -local
./runInstaller
Choose to deinstall products and select the dbhome
Run the following from node 1
cd $ORACLE_HOME/oui/bin
./runInstaller -updateNodeList ORACLE_HOME=$ORACLE_HOME "CLUSTER_NODES={rac1,rac2,rac3}"

Lastly we remove the clusterware software

Run the following from node 1, you obtain the port number from remoteport section in the ons.config file in $ORA_CRS_HOME/opmn/conf
$CRS_HOME/bin/racgons remove_config rac3:6200
Run the following from the node to be removed as user root
cd $CRS_HOME/install
./rootdelete.sh
Now run the following from node 1 as user root, obtain the node number first
  $CRS_HOME/bin/olsnodes -n
  cd $CRS_HOME/install
  ./rootdeletenode.sh rac3,3
Now run the below from the node to be removed as user oracle

   cd $CRS_HOME/oui/bin
  ./runInstaller -updateNodeList ORACLE_HOME=$ORACLE_HOME "CLUSTER_NODES={rac3}" CRS=TRUE -local
  ./runInstaller
Choose to deinstall software and remove the CRS_HOME
Run the following from node as user oracle

cd $CRS_HOME/oui/bin
./runInstaller -updateNodeList ORACLE_HOME=$ORACLE_HOME "CLUSTER_NODES={rac1,rac2,rac3}" CRS=TRUE
Check that the node has been removed, the first should report "invalid node", the second you should not see any output and the last command you should only see nodes rac1 and rac2

  srvctl status nodeapps -n rac3
  crs_stat |grep -i rac3
  olsnodes -n

Removing a NODE from RAC