T3 T1 T2 Schedule S2: It is not a serializable schedule because T2 Y (r2(Y)), which is then read and • modified by T3 (w3(Y)) T3 reads Y (r3(Y)), which then modified • before T2 modifies Y (w2(Y)). In the above order T3 interferes in the execution of T2, which makes the schedule non serializable.
T3 T1 T2 Schedule S2: It is not a serializable schedule because • T2 Y (r2(Y)), which is then read and modified by T3 (w3(Y)) • T3 reads Y (r3(Y)), which then modified before T2 modifies Y (w2(Y)). In the above order T3 interferes in the execution of T2, which makes the schedule non serializable.