Which two statements are true about RMAN duplexed backups?

Question

Options

• AIt is not supported for image copies.
• BIt is only supported for backups to tape via the media management interface.
• CDuplex backups can be performed on either disk or media, but cannot be performed on media
• DDuplex backups can contain only data files and control files.
• EFor performing duplexed backups, the parallelism for the device must be set equal to the

• A
  55% (11)
• B
  25% (5)
• D
  5% (1)
• E
  15% (3)

Explanation

A is correct because RMAN duplexing (using the COPIES parameter) applies exclusively to backup sets, not image copies - image copies are already physical file duplicates and don't support the duplexing mechanism.

C is correct (despite the truncated wording) because duplexed backups can target either disk or tape (media management) devices - they are not restricted to a single destination type.

B is wrong because duplexing is not tape-only; you can write multiple copies to disk using BACKUP ... COPIES 2 ... with a disk device type. D is wrong because backup sets subject to duplexing can include archived logs, SPFILEs, and control files - not just datafiles and control files. E is incomplete as written, but the common misconception it targets is that parallelism must match the copy count; in reality, RMAN manages copy distribution independently of the device parallelism setting.

Memory tip: Think "duplex = backup SET copies only" - just as a duplex printer makes copies of a document (not a photo print), RMAN duplexing copies sets, not image files. If you remember that, A eliminates itself and you can reason through the rest.

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