Recently Oracle has introduced a new version of the database Oracle 18c. When the new version rolls out people want to uninstall the old version and install the new one. Here in this tutorial, I will say the procedure how to Completely Uninstall Or Remove Oracle 12c Database from your Windows computer. In this post I will use Windows 7 OS, this method will be the same for all other Windows versions later Windows 7.

If you did not installed any Oracle Database previously, see this post

How to Install Oracle 18c Database on Windows 7 / 8 / 10


How to Uninstall

First, Make sure you are logged in as Administrator.


Go to SQL Plus and run the following Command to Stop Database Instances.

shutdown immediate;

Then right click on My computer and go to Properties & click on Advanced System Settings.


Go to Environment Variables

Remove those paths only which are linked to the folder where Database was Installed.

Then go to Run & type “regedit”.

Then go to the Following Registry Path & Delete Oracle Folder.



Then go to Following Registry Path & Delete everything which starts with “Oracle”


Then Go to C:\Program Files & delete Oracle Folder.

Also, Delete the Database Installation Path / Folder. In this case App Folder under C drive.

Now Go to Services From Start Menu

Stop All the Services which Name Starts with “Oracle”

Now go to Search Menu and search “%temp%” &  Delete All temp Menu items

Now Finally Restart your Computer

Now your Computer is Oracle Database free 🙂

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