In the Enterprise Library the default DB Authentication and Authorization provider is based on Microsoft SQL Server.
After you install EL you are going to find a transact sql script with all the related tables and stored procedures.
I made a port of this script to support Oracle 9.0i databases, basically you first have to create a package named "cursor_types" and declare a cursor named "curout", and then you can execute the script.
If you want the script please send me an email.
Pablo