Question 3: Transactions and Loggings Assume there are three transactions, T1, T2 and T3. The initial value of A is 0. T1: A= A +2 T2 : A = A ×2 T3 : A=A2 1.Suppose the concurrency is enabled in the...


Question 3: Transactions and Loggings<br>Assume there are three transactions, T1, T2 and T3. The initial value of A is 0.<br>T1: A= A +2<br>T2 : A = A ×2<br>T3 : A=A2<br>1.Suppose the concurrency is enabled in the system, please provide all the possible values of<br>A and the corresponding schedules.<br>2.Please draw a figure to provide a serializable schedule with 2PL such that the result of this<br>schedule is A = 16.<br>3.Please draw a figure to provide a NON-serializable schedule with 2PL such that the result<br>of this schedule is A = 0.<br>%3D<br>4. Please draw a wait-for graph to explain that the above schedule that will generate a deadlock<br>(shared, exclusive locks).<br>

Extracted text: Question 3: Transactions and Loggings Assume there are three transactions, T1, T2 and T3. The initial value of A is 0. T1: A= A +2 T2 : A = A ×2 T3 : A=A2 1.Suppose the concurrency is enabled in the system, please provide all the possible values of A and the corresponding schedules. 2.Please draw a figure to provide a serializable schedule with 2PL such that the result of this schedule is A = 16. 3.Please draw a figure to provide a NON-serializable schedule with 2PL such that the result of this schedule is A = 0. %3D 4. Please draw a wait-for graph to explain that the above schedule that will generate a deadlock (shared, exclusive locks).

Jun 11, 2022
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