Which three are true about RMAN duplexed backup sets or image copies?

Question

Options

• AA backup set may be duplexed with both copies written to disk.
• BAn image copy on disk can be copied to disk.
• CA backup set may be duplexed with both copies written to sbt.
• DA backup set may be duplexed so that one copy is written to sbt and the other to disk.
• EAn image copy on disk can be copied to sbt.
• FAn image copy on sbt can be copied to disk.

• A
  83% (30)
• D
  6% (2)
• E
  3% (1)
• F
  8% (3)

Explanation

RMAN duplexing operates on a same-device-type rule: both copies in a duplexed backup set must target the same media type, so disk→disk (A) and sbt→sbt (C) are both valid, while mixing disk and sbt in a single duplex operation (D) is not supported. Image copies are a disk-only construct - they are physical file copies and can only exist on disk, which means copying a disk image copy to another disk location (B) is perfectly valid using the COPY command.

D is wrong because RMAN duplexing cannot split copies across different device types in a single operation - both copies must go to the same type. E is wrong because image copies cannot be sent to sbt (tape/media manager); only backup sets can target sbt. F is wrong because image copies simply cannot exist on sbt at all, making the premise impossible.

Memory tip: Use the phrase "Duplex = Same Device, Image = Disk Only" - duplexed backup sets stay on one device type (disk or sbt, never both), and image copies never leave disk, so any answer involving an image copy on sbt or a mixed-device duplex is always false.

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