To make changes to the permissions granted by the default DBA after the default DBA has become disabled:
1. Connect a SQL query tool such as SQL Explorer to the database as the new DBA user.
2. Add a user with the name of the default DBA (that is, the OS user name of the database creator) and give it DBA permissions. Use the following SQL statements, replacing "User" and "password" with the OS user name and password of the default DBA:
CREATE USER 'User','password';
GRANT DBA TO 'User';
COMMIT;
3. Reconnect to the database as the default DBA (the user who created the database). Privileges that were originally set by the default DBA can now be altered.