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3. We have the following two transactions. T1: A=A+ 1, B=B+2 T2: A=A * 1, B =B * 2 Suppose A = 1 and B = 2 initially, and the system utilizes concurrency to improve the efficiency. (1) What are the possible values of A and B after T1 and T2. (2) Please use Shared Lock (S) and Exclusive Lock (X) to show a schedule, which is non- serializable with 2 Phase Locking. (Draw a figure of the schedule and show the wait-for graph)

3. We have the following two transactions. T1: A=A+ 1, B=B+2 T2: A=A * 1, B =B * 2 Suppose A = 1 and B = 2 initially, and the system utilizes concurrency to improve the efficiency. (1) What are the possible values of A and B after T1 and T2. (2) Please use Shared Lock (S) and Exclusive Lock (X) to show a schedule, which is non- serializable with 2 Phase Locking. (Draw a figure of the schedule and show the wait-for graph)

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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3. We have the following two transactions. T1: А%3DА+ 1, В %3DВ+2 Т2: А %3D А* 1, В %3DВ*2 Suppose A (1) What are the possible values of A and B after T1 and T2. (2) Please use Shared Lock (S) and Exclusive Lock (X) to show a schedule, which is non- serializable with 2 Phase Locking. (Draw a figure of the schedule and show the wait-for graph) 1 and B = 2 initially, and the system utilizes concurrency to improve the efficiency.
Transcribed Image Text:3. We have the following two transactions. T1: А%3DА+ 1, В %3DВ+2 Т2: А %3D А* 1, В %3DВ*2 Suppose A (1) What are the possible values of A and B after T1 and T2. (2) Please use Shared Lock (S) and Exclusive Lock (X) to show a schedule, which is non- serializable with 2 Phase Locking. (Draw a figure of the schedule and show the wait-for graph) 1 and B = 2 initially, and the system utilizes concurrency to improve the efficiency.
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