Problem 11.1. Which of the following histories are conflict equivalent? H1 ={W2(x),W1(x),R3(x),R1(x), W2(y), R3 (y), R3(z),R2(x)} H2 ={R3(z), R3(y), W2 (y), R2(z),W1 (x), R3 (x), W2(x),R1 (x)} H3 ={R3(z),W2(x), W2 (y), R1 (x), R3(x), R2(z), R3(y), W1 (x)} H4 ={R2(z), W2(x), W2(y),W1 (x), R1 (x), R3(x),R3(z),R3(y)}

Computer Networking: A Top-Down Approach (7th Edition)
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Chapter1: Computer Networks And The Internet
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Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Problem 11.1. Which of the following histories are conflict equivalent?
H1 ={W2(x),W1 (x), R3(x), R1(x), W2(y), R3 (y), R3 (z), R2(x)}
H, ={R3(z), R3(y), W2 (y), R2(z), W1 (x), R3 (x), W2(x), R1 (x)}
%3D
H3 ={R3(z),W2(x), W2 (y), R1 (x), R3(x), R2(z),R3(y), W1 (x)}
H4 ={R2(z), W2(x),W2(y), W1 (x), R1(x), R3(x),R3(z), R3(y)}
%3D
Problem 11.2. Which of the above histories H¡ – H4 are serializable?
Problem 11.3. Give a history of two complete transactions which is not allowed by
a strict 2PL scheduler but is accepted by the basic 2PL scheduler.
Transcribed Image Text:Problem 11.1. Which of the following histories are conflict equivalent? H1 ={W2(x),W1 (x), R3(x), R1(x), W2(y), R3 (y), R3 (z), R2(x)} H, ={R3(z), R3(y), W2 (y), R2(z), W1 (x), R3 (x), W2(x), R1 (x)} %3D H3 ={R3(z),W2(x), W2 (y), R1 (x), R3(x), R2(z),R3(y), W1 (x)} H4 ={R2(z), W2(x),W2(y), W1 (x), R1(x), R3(x),R3(z), R3(y)} %3D Problem 11.2. Which of the above histories H¡ – H4 are serializable? Problem 11.3. Give a history of two complete transactions which is not allowed by a strict 2PL scheduler but is accepted by the basic 2PL scheduler.
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