Which two statements are true about the duplexing of the backups taken by RMAN? ()(Choose two.)
A:It's only supported for the backups performed on the tape
B:It is not supported for backup operations that produce image copies
C:Duplex backups need a parallelism for the device to be equal to number of copies
D:Duplex backups can be performed to either disk or tape, but cannot be performed on tape and disk simultaneously
出自:Oracle认证