1. In order to completely uninstall an SAP system, you need to launch the SAPINST. There are no such way to uninstall the SAP system using Add/Remove program (for Windows operating system). To execute this, choose the SAP ERP 6.0 Support Release 3 (based on which SAP version you want to uninstall) > Software Life-Cycle Options > Uninstall.
2. Locate the profile directory.
3. Select the instance(s) to uninstall (for multiple instances). You can also remove the OS users of the SAP system (SAPServiceSID, sidadm).
4. Define the database information.
5. Verify the database instance name.
6. Check the database identification (SID).
7. Select the database schema to delete.
8. Select to delete the complete database.
9. Double confirm the Parameter Summary. Once verified, you can start the execution.
10. Monitor the execution till complete and you are done!
