Manual Oracle Uninstall - Database Learners

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.
If you are running 64-bit Windows, you should also delete the HKEY_LOCAL_MACHINE/SOFTWARE/Wow6432Node/Oracle key if it exists.
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 FilesOracle” directory.
If you are running 64-bit Wiindows, you should also delete the “C:Program Files (x86)Oracle” directory.
Remove any Oracle-related subdirectories from the “C:ProgramDataMicrosoftWindowsStart MenuPrograms” 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.

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.
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