You have to reinstall the DB 64bit, when you uninstall RCU will be removed too.
After installing the DB successfully:
- install RCU again - bin/rcu.bat
- change the passwords and connection url for Data sources in Console
- change the password for Schedular in EM
Restart the services
This will solve your problem
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You can install OBIEE 11g 64 bit with Oracle DB 32bit. I have done this many times without any issue.
Have a look at the following links:
Thanks for your prompt reply, that means no need to uninstall OBIEE11g right?
How did you install OBIEE 11g 64bit successfully if you get an error while installing RCU?
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