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Oracle Uninstall [from http://www.oracle-base.com/articles/misc/ManualOracleUninstall.php]Manual Oracle Uninstall

Manual Oracle Uninstall

A number of people have contacted me regarding problems uninstalling Oracle products. The two methods listed below should only be used as a last resort and will remove all Oracle software allowing a reinstall. If you make any mistakes they can be quite destructive so be careful.

  • Windows
  • UNIX

Windows

In the past I've had many problems uninstalling all Oracle products from Windows systems. Here's my last resort method:

  • 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.

At this point your machine will be as clean of Oracle components as it can be without a complete OS reinstall.

Remember, manually editing your registry can be very destructive and force an OS reinstall so only do it as a last resort.

UNIX

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      

Hope this helps. Regards Tim...