UGC NET CS 2018 July - II Question 65

65. Consider the following schedules involving two transactions.
S1 : r1(X) ; r1(Y) ; r2(X) ; r2(Y) ; w2(Y) ; w1(X)
S2 : r1(X) ; r2(X) ; r2(Y) ; w2(Y) ; r1(Y) ; w1(X)
Which one of the following statements is correct with respect to above ?

(1) Both S1 and S2 are conflict serializable.
(2) Both S1 and S2 are not conflict serializable.
(3) S1 is conflict serializable and S2 is not conflict serializable.
(4) S1 is not conflict serializable and S2 is conflict serializable.

Answer: 4

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UGC NET CS 2018 July - II Question 64	UGC NET CS 2018 July - II Question 66