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MCQ (Single Correct Answer)
GATE CSE 2009
Consider two transactions T1 and T2 and four schedules S1, S2, S3, S4 of T1 and T2 as given below:
T1: R1[ x ] W1[ x ] W1[ y ]T2: R2[ x ] R2[ y ] W2[ y ]S1: R1[ x ] R2[ x ] R2[ y ] W1[ x ] W1[ y ] W2[ y ]S2: R1[ x ] R2[ x ] R2[ y ] W1[ x ] W2[ y ] W1[ y ]S3: R1[ x ] W1[ x ] R2[ x ] W1[ y ] R2[ y ] W2[ y ]S4: R2[ x ] R2[ y ] R1[ x ] W1[ x ] W1[ y ] W2[ y ]
Which of the above schedules are conflict-serializable?
A) S1 and S2
B) S2 and S3
C) S3 only
D) S4 only
