Explanation:Each transaction involved in the cycle is said to be deadlocked. 9. 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.
D. How many transactions will be involved in the rollback.
Answer:A
Explanation:Each transaction involved in the cycle is said to be deadlocked. 9. 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. D. How many transactions will be involved in the rollback.
Explanation:We should roll back those transactions that will incur the minimum cost. 10. __________ rollback requires the system to maintain additional information about the state of all the running transactions.