ORACLE

Back in ancient times, an oracle was someone who offered advice or a prophecy thought to have come directly from a divine source. In modern usage, any good source of information can be called an oracle. You can use roles to administer database privileges. You can add privileges to a role and then grant the role to a user. The user can then enable the role and exercise the privileges granted by the role. A role contains all privileges granted to the role and all privileges of other roles granted to it.