Consider the transactions T1, T2, T3 and the schedules S1 and S2 given below.
T1 : r1(x); r1(z); 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); w3(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 ?
1
Only S1 is conflict-serializable
2
Only S2 is conflict-serializable
3
Both S1 and S2 are conflict-serializable
4
Neither S1 nor S2 is conflict-serializable