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Discussion

Selecting the victim to be rollbacked to the previous state is determined by the minimum cost. The factors determining cost of rollback is

  • A.How long the transaction has computed, and how much longer the transaction will compute before it completes its designated task.
  • B.How many data items the transaction has used.
  • C.How many more data items the transaction needs for it to complete and how many transactions will be involved in the rollback.
  • D.All of the above

Answer: D

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