Uninstall
11g from Windows
In 11.2g there is deinstall command through which you can uninstall
standalone Oracle Database installations, Oracle Clusterware and
Automatic Storage Management (ASM) from your server, as well as
Oracle Real Application Clusters (Oracle RAC) and Oracle Database
client installations.
You can find out deinstall tool under $ORACLE_HOME/deinstall folder.
You can also download it from :
http://www.oracle.com/technology/software/products/database/index.html
(Under Oracle Database 11g Release 2, click See All for the
respective platform for which you want to download the
Deinstallation Tool.)
Here are the steps you need to follow for Deinstalling Oracle 11g on
Windows
1- Unzip the Deinstall Toll file set just downloaded and copy it
over to any directory you want
or go to the Folder C:\app\product\11.2.0\dbhome_1\deinstall
2- Open command prompt(Run as Administrator) and go to the proper
location
3- Set you ORACLE_HOME to the Home which you want to deinstall using
this command
set ORACLE_HOME = C:\app\product\11.2.0\dbhome_1
4- Now you are ready to unistall it. Tool is being run outside the
Oracle Home
Type:
C:\app\product\11.2.0\dbhome_1\deinstall\deinstall -home
C:\app\product\11.2.0\dbhome_1
At this point Oracle will ask you several questions and it will
start the deinstallation process.