Installing and uninstalling Oracle is a bit more difficult than other mysql software, so far, I have uninstalled the previous Oracle software and re-installed it (successfully), and there is a tutorial written below.

  • First, open the services, find the services that start with Oracle, and close them all

  • Click on the Start menu to find – > toOSoftware at the beginning >Universal Installer



  • After clicking, the uninstallation interface will pop up

  • findOraDb11g_home1Check all the directories under and click Delete







  • Win+ROpen the run screen and enterregeditPress Enter to enter the registry editor
  • deleteHKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\All under the pathOracleThe name of the service to start

  • deleteHKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Eventlog\ApplicationRegistry of allOracleAll folders at the beginning

  • deleteHKEY_LOCAL_MACHINE\SOFTWARE\ORACLEThe registry
  • Delete all files in the Oracle installation directory, such as:All files in D:\app directory
  • Delete drive CC:\Program FilesorC:\Program Files(x86)In the directoryOracledirectory
  • Finally, remove deleted files from the recycle bin
  • At this point, Oracle uninstall is complete.