Let objects x and y be stored at site 1 and objects z and w, Ask an Expert

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Let objects x and y be stored at site 1, and objects z and w be stored at site 2. Determine, for each of the following executions, whether the execution is serializable or not. If it is serializable, determine all possible total orders of transactions. If it is not serializable, prove that there is no total order possible.

Execution 1:

S1: Ri(x) Rj(x) Wj(y) Wi(x)

S2: Ri(w) Rj(z) Wj(w) Wi(w)

Execution 2:

S1: Ri(x) Rj(x) Wj(y) Wi(y)

S2: Wi(z)

Execution 3:

S1: Ri(x) Rj(x) Wi(x) Wj(y)

S2: Ri(z) Rj(z) Wj(z) Wi(w)

Execution 4:

S1: Ri(y) Rj(x) Wj(x)

S2: Wi(z) Ri(w) Rj(w) Wi(w)

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Computer Engineering, Engineering

Category:- Computer Engineering
Reference No.:- M9902837

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