Can Oracle be reinstalled if it is not cleanly uninstalled?

Under normal circumstances, Oracle can be reinstalled if it is not cleanly uninstalled. The following steps are required: 1. Completely clear leftovers (registry keys, configuration files, data files, binaries); 2. Restart the system; 3. Reinstall Oracle; 4. Configure the new installation. If you have questions, please contact Oracle Support.

Oracle is not cleanly uninstalled, can it be reinstalled?

Answer: Generally, yes.

Detailed description:

Incomplete uninstallation of Oracle will result in residual registry keys, configuration files, data files and binary files in the system. These residues may interfere with the installation of new versions. However, Oracle can usually be reinstalled using the following steps:

1. Completely remove the residue:

• Use Oracle Universal Installer (OUI) or a third-party tool (eg Oracle Database Remover) completely removes all Oracle components.
• Manually delete all remaining registry keys (HKEY_LOCAL_MACHINE\Software\Oracle).
• Manually delete all remaining configuration files (such as the %ORACLE_HOME%\inventory directory).
• Manually delete all residual data files (such as the %ORACLE_BASE%\oradata directory).
• Manually delete any remaining binary files (such as the %ORACLE_HOME%\bin directory).

2. Restart the system:

• Restart the computer to clear any residual data from memory.

3. Reinstall Oracle:

• Reinstall Oracle using OUI or another installer.
• During the installation process, make sure to install to a new target directory to avoid overwriting any existing remnants.

4. Configure the new installation:

• After completing the installation, configure the newly installed Oracle instance.
• Check if there are any error or warning messages and resolve accordingly.

NOTE:

• In some cases, the residue may be very stubborn and require more advanced removal methods.
• It is recommended to perform a thorough backup before uninstalling Oracle.
• If you are still experiencing problems after reinstalling, please consult Oracle Support for assistance.

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