How to uninstall Oracle

From "Uninstalling Oracle 8":

To remove Oracle components from a Windows machine, first take a full system backup of your server! You could try uninstalling Oracle via the Installer but if this does not work, follow this manual procedure:

Detailed steps can be found in the Oracle Installation Guide for Windows on Oracle's Technology Network.

From "Uninstalling Oracle9i":

To uninstall Oracle, follow these steps:

You should now have a clean machine that you can reinstall Oracle on.

From "Removing Oracle9i and reinstalling it": A user wrote, "I want to completely remove Oracle 9i from my computer and install it again. How to remove it from the REGEDIT?" Maria Anderson responded:

Did you uninstall the Oracle software using the Oracle Universal Installer? When using the OUI, it will generally clean up all required registry entries for you. If you want to remove the Oracle software manually, there is a very good article on Metalink (Doc ID #124353.1) which describes in detai

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l how to manually remove Oracle components on the Windows platform. At a high level, the steps you need to take to uninstall Oracle are as follows:

One word of caution is to be very careful editing registry entries.

If, after de-installation, Oracle services are still showing up in the administrative tasks, follow this advice (from "Uninstalled services still showing up in Win2000"):

You'll have to edit the registry to delete all existing ORACLE services. First make sure all services are stopped, then use the Registry Editor (REGEDIT) and remove any folders in the locations listed below that have the service name you wish to remove.

There are typically two control sets, ControlSet001 and ControlSet002. But, your environment may be different. Therefore, check all of your control sets, signified by the X, that exist in your registry. Delete any folders in the above locations with the name OracleXXX.

Did you erase more registry keys than necessary? The best way to uninstall Oracle is to use the Oracle Universal Installer (OUI) because it clears out relevant registry entries, along with the inventory and operating system files. Start the OUI and uninstall all Oracle products, then try the installation again. (From "Erased too many registry keys with deinstall")

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