Cry How To...
Uninstall Oracle 9i
These notes apply to Oracle 9i
The simplest way to remove Oracle is to run the Oracle installer:
Start > Programs > Oracle Installation Products > Universal
- On the first screen click on "Deinstall Products..."
- Expand the tree view (just so that the second level is visible)
and make sure you select everything that is selectable.
- Click on "Remove..."
- On the confirmation screen click "Yes"
- When it has finished click "Close" and then "Exit" to quit the installer
Whilst the Oracle installer removes many components there are a number
of things that it leaves behind. In order to completely remove all traces
of Oracle the following additional steps will need to be taken:
- Stop any Oracle services that have been left running. (Start > Settings
> Control Panel > Services.)
Services which I have found left behind are '
OracleServiceORACLE'. However there may be others
depending on your installation. Look for any services with names starting
- Run regedit (Start > Run > Enter "regedit", click "Ok"), find and
delete the following keys:
Note: I have had it reported that some people also have registry entries
HKEY_CURRENT_USER\SOFTWARE\ORACLE, this registry
entry may be created by some Oracle utilities. If it exists then delete
- Delete the Oracle home directory:
This will also remove your database files (unless you located them elsewhere,
in which case you will need to delete them separately).
- Delete the Oracle program Files directory:
- Delete the Oracle programs profile directory:
C:\Documents and Settings\All Users\Start Menu\Programs\Oracle
if you did not first run the Oracle installer to remove Oracle then
there may be other Oracle profile group directories to remove.
- Some of the Oracle services may be left behind by the uninstall.
Open ‘services’ on the control panel, make a note of which Oracle services
remain and see the notes ‘How
to remove a service’ to remove them.
- If you didn't first run the Oracle Installer to remove Oracle then
you may have some references to Oracle left in the path. To remove these:
Start > Settings > Control Panel > System > Advanced > Environment Variables,
look at both the use and system variable 'PATH' and edit them to remove
any references to Oracle.
Acknowledgements: My appreciation to Alistair Jones for help on this
procedure and for encouragement to write it.
These notes have been tested with Oracle 9i under Windows
This page represents one page of many pages of notes I made whilst working
with Oracle 7 through to 10i. I now no longer work with Oracle databases,
but hope that these notes will continue to be of benefit to others.
About the author: Brian Cryer
is a dedicated software developer and webmaster. For his day job he
develops websites and desktop applications as well as providing
IT services. He moonlights as a technical author and consultant.