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Quickly uninstall Oracle

Oracle Database Tips by Donald BurlesonJuly 11,  2015

Question:  I want the steps to manually uninstall Oracle on my server.  I don't want to use an uninstall wizard and I want to understand the steps to remove the installation..

Answer:  In essence, uninstalling Oracle involves two major steps, removing the executable code from the server and downgrading the Oracle data dictionary.  Note:  An uninstall cannot be recovered, so make sure to take a full backup of all server-side components before uninstalling Oracle.

Manually uninstalling Oracle

For experienced DBA's, the manual uninstall is the preferred method of uninstalling Oracle

Step 1:  Nuke all Oracle processes.  The uninstall requires stopping all Oracle instances, listeners and daemon processes that are associated with the release:

$ORACLE_HOME/bin/shutdown abort
$ORACLE_HOME/bin/emctl stop dbconsole
$ORACLE_HOME/bin/lsnrctl stop
$ORACLE_HOME/bin/isqlplusctl stop

Step 2:  Take a full backup of $ORACLE_HOME.  In UNIX/Linux you can make a backup copy in case you need anything later:

root> tar -xvf $ORACLE_HOME > /dev/rmt0/bkup

Step 3:  Remove $ORACLE_HOME and all subdirectories.  You can use the DBCA uninstaller function if you are on 10g or beyond.  In UNIX/Linux you can remove the software footprint as follows:

root> cd $ORACLE_HOME
root> rm -RF *

Step 4: Remove entries in shared parm files.  The database may participate in server-side parameter files and you want to complete the uninstallation process by removing references to the database in these locations specified by the "dest" parameters in the init.ora file (e.g. log_archive_dest_n):

  • tnsnames.ora
  • protocol.ora
  • listener.ora
  • oratab (/etc or /var/opt/oracle)

 

Assisted Oracle uninstall

For beginners and those who are unfamiliar with the components of Oracle, the Oracle DBCA has assisted uninstall procedures:

Step 1:  Nuke all Oracle processes.  The uninstall requires stopping all Oracle instances, listeners and daemon processes that are associated with the release:

$ORACLE_HOME/bin/shutdown abort
$ORACLE_HOME/bin/emctl stop dbconsole
$ORACLE_HOME/bin/lsnrctl stop
$ORACLE_HOME/bin/isqlplusctl stop

Step 2:  Start the Database Creation Assistant (DBCA) and choose the remove database option

Step 3:  Use the assisted deinstall wizard.  Execute the Oracle Universal Installer (OUI)

$ORACLE_HOME/oui/bin/runInstaller

Step 4. In the OUI Welcome window, click the "Deinstall Products" button.

Step 5. In the OUI software Inventory screen, select the Oracle home and the products that you want to remove, cross your fingers and mash the "Remove" button.
 

Uninstall Oracle on Windows:

Its easy to uninstall Oracle on Windows :

  • Uninstall all Oracle components using the Oracle Universal Installer (OUI).
  • Run regedit.exe and delete the HKEY_LOCAL_MACHINE/SOFTWARE/ORACLE key. This contains registry entires for all Oracle products.
  • Delete any references to Oracle services left behind in the following part of the registry (HKEY_LOCAL_MACHINE/SYSTEM/CurrentControlSet/Services/Ora*). It should be pretty obvious which ones relate to Oracle.
  • Reboot your Windows box.
  • Delete the "C:\Oracle" directory, or whatever directory is your ORACLE_BASE.
  • Delete the "C:\Program Files\Oracle" directory.
  • Empty the contents of your "C:\temp" directory.
  • Empty your recycle bin.

 


 

 

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Note: This Oracle documentation was created as a support and Oracle training reference for use by our DBA performance tuning consulting professionals.  Feel free to ask questions on our Oracle forum.

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