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      Question

      Distributed 2-Phase Commit (2PC) can suffer

      from:
      A Lost update anomaly Correct Answer Incorrect Answer
      B Coordinator failure blocking all participants Correct Answer Incorrect Answer
      C Phantom reads Correct Answer Incorrect Answer
      D Index inconsistency Correct Answer Incorrect Answer
      E Write skew Correct Answer Incorrect Answer

      Solution

      If coordinator crashes after “prepare” but before “commit,” participants may block.

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