I post this topics for people who want to learn how to remove Oracle For Window/Linux
Windows :
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
Delete the /etc/oratab file
Done .
