How To Uninstall Oracle From Windows

Rapidly uninstall Oracle Oracle Database Tips by Donald BurlesonJuly xi,  2015

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

Reply:  In essence, uninstalling Oracle involves ii major steps, removing the executable code from the server and downgrading the Oracle data dictionary. Note :  An uninstall cannot exist recovered, so make sure to have a full fill-in of all server-side components before uninstalling Oracle.

Manually uninstalling Oracle

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

Step ane:  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 end dbconsole
$ORACLE_HOME/bin/lsnrctl stop
$ORACLE_HOME/bin/isqlplusctl finish

Footstep two:  Take a full fill-in of $ORACLE_HOME. In UNIX/Linux you tin can brand 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 role if you are on 10g or beyond.  In UNIX/Linux you lot can remove the software footprint as follows:

root> cd $ORACLE_HOME

root> rm -RF *

Pace 4: Remove entries in shared parm files.  The database may participate in server-side parameter files and you lot desire 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.one thousand. 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 one:  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 terminate

Step 2:  Outset the Database Creation Banana (DBCA) and cull the remove database option

Step iii:  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.

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

Uninstall Oracle on Windows:

Its like shooting fish in a barrel 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 post-obit role of the registry (HKEY_LOCAL_MACHINE/Organisation/CurrentControlSet/Services/Ora*). It should be pretty obvious which ones chronicle to Oracle.
• Reboot your Windows box.
• Delete the "C:\Oracle" directory, or any directory is your ORACLE_BASE.
• Delete the "C:\Programme Files\Oracle" directory.
• Empty the contents of your "C:\temp" directory.
• Empty your recycle bin.
  

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Source: http://www.dba-oracle.com/t_uninstall_software.htm

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