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Which of the following is not a consequence of concurrent operations?

  • A.Lost update problem
  • B.Update anomaly.

  • C.Unrepeatable read.
  • D.Dirty read.

Answer: B

Correct answer: Update anomaly.

Lost updates, unrepeatable reads and dirty reads all arise from transactions running at the same time. An update anomaly is a consequence of poor normalisation - the same fact stored twice - and would occur even with one user.

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