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Which of the following is not a recovery technique?

  • A.Deferred update
  • B.Immediate update
  • C.Two-phase commit
  • D.Shadow paging

Answer: C

Correct answer: Two-phase commit

Deferred update, immediate update and shadow paging are all recovery techniques. Two-phase commit is a protocol for making a distributed transaction commit consistently across several sites - a concurrency and coordination problem rather than recovery from failure.

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