Manually uninstalling oracle

Oracle 10g


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:


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.

If some DLLs can’t be deleted, try renaming them, the after a reboot delete them.

( OR )

Oracle11g introduce new utility “deinstall” to uninstall/deinstall oracle database with configuration files.

run deinstall.bat file $ORACLE_HOME/deinstall/deinstall.bat

and give the prompt details then system will remove all the related files/services/folder.

if oci.dll not delete during deinstall process then restart system and delete manually.


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.


#  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