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A transaction manager is which of the following?

  • A.Maintains a log of transactions
  • B.Maintains before and after database images
  • C.Maintains appropriate concurrency control
  • D.All of the above.

Answer: D

Correct answer: All of the above.

The transaction manager is responsible for atomicity and isolation, so it must log what each transaction does, hold the before and after images needed to undo or redo it, and apply the concurrency control that keeps concurrent transactions from interfering. All three are aspects of the same duty.

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