Oracle complete uninstall manual

When you uninstall RDMBS such as SQL server and Oracle, if it is not unloaded cleanly, it will lead to the problem that it cannot be re installed. The fundamental reason is that there are too many registry keys, local files, and even hidden files left behind. According to personal experience, this article searches and sorts out some steps that may be able to uninstall Oracle cleanly for your reference.

Environmental Science:

Oracle 11g 11.2.0.40Windwos 7

1、 Uninstall Oracle

1. Start control panel management tools services stop all Oracle related services services.msc

2. Start – program – Oracle – Oracle installation products – Universal installer: start to uninstall Oracle except 11g_ All products except home1




2、 Cleaning up registry keys

1. Clear the related key in the registry

shortcut key win + R - "regedit

HKEY_ LOCAL_ Machine/software/Oracle delete this directory and all its children
hkey_ LOCAL_ Delete all directory entries beginning with Oracle or oraweb
hkey_ LOCAL_ Delete all Oracle start directories and their subkeys
hkey_ CLASSES_ Root delete all the directories with ora, Oracle, orcl and enumora prefixes and their subkeys

hkey_ CURRENT_ User/software/Microsoft/Windows/CurrentVersion/Explorer/menuorder/start menu/programs, directory of all Oracle prefixes and its children HKEY_ LOCAL_ MACHINE\SOFTWARE\ODBC\ ODBCINST.INI All Oracle related directories and their subitems except Microsoft ODBC for Oracle

2. Clear environment variables

My computer - properties - Advanced - environment variables, delete Oracle related environment variables in path and classpath

3. In the start menu, clear the Oracle directory

4. Delete the Oracle related directory from the disk (unauthorized access, locked, etc. after restarting the computer, the file occupation can be released and deleted)

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