Uninstall Oracle in Linux/Window

Uninstall Oracle database on without formatting the whole system.

 In Linux

Uninstalling all products from UNIX is a lot more consistent. If you do need to resort to a manual uninstall you should do something like:

• Uninstall all Oracle components using the Oracle Universal Installer (OUI).
• Stop any outstanding processes using the appropriate utilities.
  

  # oemctl stop oms user/password
  # agentctl stop
  # lsnrctl stop

  Alternatively you can kill them using the kill -9 pid command as the root user.
• Delete the files and directories below the $ORACLE_HOME.
  

  # cd $ORACLE_HOME
  # rm -Rf *

• With the exception of the product directory, delete directories below the $ORACLE_BASE.

  # cd $ORACLE_BASE
  # rm -Rf admin doc jre o*

• Delete the /etc/oratab file. If using 9iAS delete the /etc/emtab file also.

  # rm /etc/oratab /etc/emtab

 

In Window

* 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 entries 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.
Hope Oracle would no longer bother you anymore...