Determine all possible total orders of transactions

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Reference no: EM13323535

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)

Reference no: EM13323535

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