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多选题
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


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