多选题
Which two statements are true about the duplexing of the backups taken by RMAN? （）(Choose two.)
发布日期：2020-04-10
It's only supported for the backups performed on the tape
It is not supported for backup operations that produce image copies
Duplex backups need a parallelism for the device to be equal to number of copies
Duplex backups can be performed to either disk or tape, but cannot be performed on tape and disk simultaneously
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