Choose three.
Which three are true about Recovery Manager (RMAN) active database duplication?
A.Pre-existing backups of the database to be duplicated are required for the "push" method of duplication. B.Pre-existing backups of the database to be duplicated are required for the "pull" method of duplication. C.Pre-existing backups of the database to be duplicated are always used if they exist. D.Image copies can be used to duplicate the active database. E.The active database must be duplicated while in OPEN state. F.No connection to the recovery catalog is required for active database duplication. G.Backup sets can be used to duplicate the active database.正确答案DFG
