Overview
After I had installed RDBMS 11.2.0.1 (See Install Oracle RDBMS 11.2.0.1.0 with Grid Infrastructure ), I relised that I had installed the wrong Oracle version (11.2.0.1 instead of 11.2.0.3), and I had to de-install RDBMS 11.2.0.1.
Prequisite
RDBMS 11.2.0.1 installed
Procedure
Ran the following commands on GRIDCTRL :
export ORACLE_HOME=/opt/oracle/app/product/11.2.0/dbhome_1/
export ORACLE_BASE=/opt/oracle
cd $ORACLE_HOME/deinstall/
./deinstall
The log is attached as Deinstall_DB_11_2_0_1_grid .