Discussion
Selecting the victim to be rolled back to its previous state is determined by the minimum cost. The factors determining the cost of a rollback are
Answer: D
Correct answer: All of the above
Choosing the victim means choosing the cheapest rollback, and all three factors bear on the cost: how much work would be lost and how much remains, how many data items the transaction has already used, and how many more it needs and how many other transactions the rollback would drag in. A further consideration is how often a transaction has already been rolled back, so that no transaction is starved.
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