Uninstall OBIEE 11g

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Here you go …

• Stop all running processes for Admin and Managed servers including BI components services. Stop all the processes, if any, created during service process creation for e.g. Windows Process.
• Remove the Weblogic Server using the Un-installation wizard under Control Panel.
• Perform De-install from Oracle Business Intelligence -) De-install option of Program menu
• Drop the RCU schemas using the RCU batch file -) Drop option
• Manually remove the RCU Tablespace DBF file (to have a clean new RCU schema) . In my case I didn’t remove the DBF file as the Database server is under DBA’s control .Hence, to be safer side I re-create the RCU during the fresh installation process under different tablespace. This will make sure nothing is going to messed up with your previous installation … See below image:

• De-install Middleware Oracle home (traverse to ..\[MIDDLEWARE_HOME]\Oracle_BI\oui\bin\ and execute below from command line: setup.exe -deinstall)
• De-install the Middleware common Oracle Home  (traverse to ..\[MIDDLEWARE_HOME]\oracle_common\oui\bin\ and execute below from command line: setup.exe -deinstall –jreLoc  ..\[MIDDLEWARE_HOME]\Oracle_BI1\jdk)
• Remove the Middleware Home directory with all contents forcefully,if reqd.
• Remove the environment variable pointing to earlier locations and the relevant paths if any. This is Important!
• Re-boot the entire server.
• Delete the Oracle common keys , if any, from registry. This is Important ! Most of the common problem lies here . So in my case I follow the process of finding my Middleware Home path from Registry and delete all relevant Keys and values . Be careful while playing with registry 
• Remove the windows service process key from registry , if any
• As in my case I don’t need to De-install my Oracle Client/DB Home hence I skip the process as I going to re-use the same Oracle Home in the next installation time.So if you are going to do the same probably you can skip De-installing your Oracle Client/DB home.

Thats it , Welldone! until you have performed the clean installa