Remove Oracle / Uninstall

Its easy common steps you have to follow :

• Uninstall all Oracle components using the Oracle Universal Installer (OUI).
• Run regedit.exe and delete the HKEY_LOCAL_MACHINE/SOFTWARE/ORACLE key. This contains registry entires for all Oracle products.
• Delete any references to Oracle services left behind in the following part of the registry (HKEY_LOCAL_MACHINE/SYSTEM/CurrentControlSet/Services/Ora*). It should be pretty obvious which ones relate to Oracle.
• Reboot your machine.
• Delete the “C:\Oracle” directory, or whatever directory is your ORACLE_BASE.
• Delete the “C:\Program Files\Oracle” directory.
• Empty the contents of your “C:\temp” directory.
• Empty your recycle bin.

Unix :

• Uninstall all Oracle components using the Oracle Universal Installer (OUI).
• Stop All Oracle Process .

lsnrctl stop
emctl stop dbconsole
emctl stop agent.

• Delete the files and directories below the $ORACLE_HOME.

# cd $ORACLE_HOME
# rm -Rf *

•  delete directories below the $ORACLE_BASE.

 # cd $ORACLE_BASE
# rm -Rf admin