Prerequisites
You must have a database installed and configured.
If your existing database is not UTF-8 format, you will get a warning message that you can ignore.
If you are installing a new database, set it to use UTF-8 format.
You must alter these Oracle database parameters:
Alter system set processes=500 scope=spfile
Alter system set open_cursors=800 scope=spfile
Restart database before running RCU