If Oracle is installed locally and you choose to uninstall it, use the Oracle runInstaller utility. Run the utility on each node you are removing from the cluster.
To uninstall Oracle on a local node using runinstaller utility
On one node, log in as oracle.
Set the DISPLAY variable.
If you use the Bourne Shell (bash, sh or ksh):
$ export DISPLAY=host:0.0
If you use the C Shell (csh or tcsh):
$ setenv DISPLAY host:0.0
On the first node, run the Oracle9i runInstaller utility:
$ /cdrom/Disk1/runInstaller
As the utility starts up, select the option to uninstall the Oracle software from the local node you are removing.
Refer to the Oracle Installation Guide for details on the utility.