> I created a database with another user than SYSDBA and I create role
> SYSDBA.
> Ok now I cannot enter with SYSDBA user but only with a valid user,
> The Problem is that the database owner not is a super user as SYSDBA
> and it can manages only its objects, not all objects as SYSDBA.

The db owner should be able to manage all objects in the db. It can also
backup and restore the DB. What objects can you not manage?
Alan