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What should I do if the Oracle database is not uninstalled cleanly?

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Release: 2024-04-18 15:30:27
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When the Oracle database is not uninstalled cleanly, residual files will appear in the registry and operating system, affecting subsequent installation or operations. The processing steps are as follows: check whether there are any residual entries in the registry; clean the operating system files and folders; reinstall the Oracle database; manually repair the Oracle service; and rebuild the Oracle network configuration.

What should I do if the Oracle database is not uninstalled cleanly?

What to do if the Oracle database is not uninstalled cleanly

#Question: What to do if the Oracle database is not uninstalled cleanly ?

Answer:

Incomplete uninstallation of the Oracle database will result in residual files and configuration information in the registry and operating system, affecting subsequent database installation or operations.

Processing steps:

1. Check whether there are any residual entries in the registry

  • Open the registry editor (regedit.exe)
  • Navigate to the following path: HKEY_LOCAL_MACHINE\SOFTWARE\Oracle
  • Delete all subkeys related to the Oracle instance that was not completely uninstalled

2. Clean operating system files and folders

  • Delete the Oracle installation directory (usually C:\oracle\)
  • Remove Oracle services and drivers:

    • Open "Computer Management" (compmgmt.msc)
    • Expand "Services and Applications" → "Services"
    • Stop and delete Oracle-related services
  • Delete the following folder:

    • %WINDIR%\oracle (Oracle files in the Windows directory )
    • %ProgramFiles%\Oracle (Oracle files in Program Files)
    • %WINDIR%\SysWOW64\oracle (32-bit Oracle files in 64-bit systems)

3. Reinstall the Oracle database

  • Reinstall the Oracle database in a clean environment.
  • Make sure to use the same version and patch as before the complete uninstall.

4. Manually repair the Oracle service

  • If the database service still cannot start after reinstallation, please try to repair it manually:
  • Open command prompt (cmd.exe)

    • Run with administrator privileges
  • Navigate to the Oracle service installation directory (usually For C:\oracle\\crs\bin)

    • 64-bit system: cd C:\oracle\\crs\bin\amd64
    • 32-bit system: cd C:\oracle\\crs\bin\i386
  • ##Run the following command: caddsrv –init

      This will recreate the Oracle service and set it to start automatically
##5. Rebuild the Oracle network configuration

If there is a problem with the network configuration, please rebuild:
  • Open the command prompt (cmd.exe)
  • Run with administrator privileges
    Navigate to the Oracle network configuration directory (usually C:\oracle\\network\admin)
  • Rename sqlnet.ora and tnsnames.ora File
  • Restart Oracle service
  • Oracle will automatically create a new version of the file

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