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GATE | GATE-CS-2014-(Set-3) | Question 65
Consider the transactions T1, T2, and T3 and the 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)
Which one of the following statements about the schedules is TRUE?
(A)
Only S1 is conflict-serializable.
(B)
Only S2 is conflict-serializable.
(C)
Both S1 and S2 are conflict-serializable.
(D)
Neither S1 nor S2 is conflict-serializable.
Answer
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