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Module 4: Transaction Processing

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Consider the transactions T1, T2 and T3 and schedules S1 and S2 given below:
T1 : r1 (X); r1(Z); w1 (X); w1 (Z),
T2 : r2 (Y); r2 (Z); w2 (Z)
T3 : r3 (Y); r3 (X); w3 (Y)
S1 : r1 (X); r3(Y); r3(X); r2 (Y); r2(Z); w3(Y); w2 (Z); r1 (Z); w1(X), w1 (Z).
S2 : r1 (X); r3 (Y); r2(Y); r3(X); r1(Z); r2(Z); w3 (Y); w1 (X); w2(Z), w1 (Z).
Determine which of the above schedules are conflict – serializable.

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