Let 2PL be a scheduler based on the two-phase locking protocol and let TS be a scheduler based on the timestamping protocol. Here is a schedule of three transactions: r1(X), w1(X), r2(X), w2(X), r3(Y), w3(Y), r1(Y), w1(Y) Determine the following: Is the schedule serial? Is it serializable? Can it be produced by 2PL?
Let 2PL be a scheduler based on the two-phase locking protocol and let TS be a scheduler based on the timestamping protocol. Here is a schedule of three transactions: r1(X), w1(X), r2(X), w2(X), r3(Y), w3(Y), r1(Y), w1(Y) Determine the following: Is the schedule serial? Is it serializable? Can it be produced by 2PL?
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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| Let 2PL be a scheduler based on the two-phase locking protocol and let TS be a scheduler based on the timestamping protocol. Here is a schedule of three transactions: r1(X), w1(X), r2(X), w2(X), r3(Y), w3(Y), r1(Y), w1(Y) Determine the following: Is the schedule serial? Is it serializable? Can it be produced by 2PL? Then, identify the true statement from the list below. |
| a) | S is not serial and S cannot be produced by 2PL | ||
| b) | S is serial and S can be produced by 2PL | ||
| c) | S is not serializable and S cannot be produced by TS | ||
| d) | S is not serial and S cannot be produced by TS |
which one ?
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