Give examples of schedules at the SNAPSHOT isolation that are
a. Serializable and hence correct.
b. Nonserializable and incorrect.
a. r1(x) r1(y) r2(y) r2(z ) w1(x) w2(z) is serializable in either order.
b. r1(x) r1(y) r2(x) r2(y) w1(y) w2(x) is not serializable. T1 and T2 read the same snapshot, but since they write different data items, they are both allowed to commit.
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