What to do if oracle is not uninstalled cleanly

Solution to fix the unclean uninstallation of Oracle: Manually clean residual files, including the Oracle installation directory, "C:\app\oracle", and "C:\Program Files\Oracle". Clean the "HKEY_LOCAL_MACHINE\SOFTWARE\Oracle" phase key and subkey in the registry. Uninstall all Oracle-related drivers. Uninstall Oracle components and registry keys using Oracle Universal Installer (OUI). Consider using a third-party uninstaller, such as Revo Uninstaller or IOb

How to deal with Oracle uninstallation unclear

Introduction
When trying to uninstall an Oracle database, you may sometimes encounter unclear uninstallation, resulting in residual files, directories, and registry entries in the system. This may affect subsequent installation or other operations.

reason
There may be a variety of reasons why Oracle uninstallation is not clean, including:

• Manual uninstallation process is incomplete
• Installer error
• Insufficient system permissions
• Anti-virus software interference

Solution
To resolve the problem of unclear Oracle uninstallation, you can take the following steps:

1. Manually clean the residual files

• Navigate to the Oracle installation directory and delete all files and folders. The default path is "C:\oracle\product\12.2.0\dbhome_1".
• Delete the "C:\app\oracle" directory (if it exists).
• Delete the "C:\Program Files\Oracle" directory (if it exists).

2. Clean the registry keys

• Open the Registry Editor (run "regedit").
• Navigate to "HKEY_LOCAL_MACHINE\SOFTWARE\Oracle".
• Delete all keys and subkeys containing the word "Oracle".

3. Uninstall the driver

• Open Device Manager (run "devmgmt.msc").
• Expand System Devices to uninstall all Oracle-related drivers.

4. Use Oracle Universal Installer

• Download and run Oracle Universal Installer (OUI).
• Select "Uninstall Product" and follow the prompts. OUI will help you delete Oracle components and registry keys.

5. Use third-party uninstallation tools

• Consider using a third-party uninstaller, such as Revo Uninstaller or IObit Uninstaller. These tools can help you completely remove Oracle and other applications.

Precautions
To avoid unclear Oracle uninstallation, follow these precautions:

• Always use the official Oracle installer.
• Make sure you have sufficient operating system permissions.
• Disable anti-virus software during uninstallation.
• Follow the Oracle documentation to carefully perform the uninstallation steps.

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