DBMS Concurrency Control Lock

Which of the following schedule results unrepeatable read problem

S1:r2(x) r2(y) r1(x) r1(y) w1(x) r2(x)

S2: r2(x) r2(y) w1(x) r1(x) r2(y)

S3: r2(x) r2(y) r1(x) r1(y) w1(x) w2(x)

1

S1

2

S2

3

S3

4

All of these

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