I found this article on http://www.oracle-base.com on how to remove oracle database manually.
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 theHKEY_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
In RHEL4, I also remove /etc/oraInst.loc and oracle inventory file. $HOME/oraInventory.