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Shadow paging has

  • A.no redo
  • B.no undo
  • C.redo but no undo
  • D.neither redo nor undo

Answer: A

Correct answer: no redo

Shadow paging keeps the old page table until the transaction commits, and commits by switching to the new one atomically. So an aborted transaction is undone simply by discarding the new pages, and a committed one is already complete on disk - there is nothing to redo.

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