Question: Exercise 18.3.1: Below are two transactions, with lock requests and the se- mantics of the transactions indicated. Reca from Exercise 18.2.1 that these transactions have

Exercise 18.3.1: Below are two transactions, with lock requests and the

se- mantics of the transactions indicated. Reca from Exercise 18.2.1 that these

Exercise 18.3.1: Below are two transactions, with lock requests and the se- mantics of the transactions indicated. Reca from Exercise 18.2.1 that these transactions have the unusual property that they can be scheduled in ways that are not conflict-serializable, but, because of the semantics, are serializable. u1(B); 904 CHAPTER 18. CONCURRENCY CONTROL u2(A); In the questions below, consider only schedules of the read and write actions, not the lock, unlock, or assignment steps

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