Consider the following four schedules due to three transactions (indicted by the subscript) using read and write on a data item x, denoted r (x) and w (x) respectively. Which one of them is conflict serializable?

r1 (x) ; r2 (x) ; w1 (x) ; r3(x) ; w2 (x)

r2 (x) ; r1 (x) ; w2 (x) ; r3(x) ; w1 (x)

r3 (x) ; r2 (x) ; r1 (x) ; w2(x) ; w1 (x)

r2 (x) ; w2 (x) ; r3 (x) ; r1(x) ; w1 (x)

Consider the following four schedules due to three transactions (indic

1.	Consider the following four schedules due to three transactions (indicted by the subscript) using read and write on a data item x, denoted r (x) and w (x) respectively. Which one of them is conflict serializable?
A.	r1 (x) ; r2 (x) ; w1 (x) ; r3(x) ; w2 (x)
B.	r2 (x) ; r1 (x) ; w2 (x) ; r3(x) ; w1 (x)
C.	r3 (x) ; r2 (x) ; r1 (x) ; w2(x) ; w1 (x)
D.	r2 (x) ; w2 (x) ; r3 (x) ; r1(x) ; w1 (x)
Answer» E.

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Consider the following four schedules due to three transactions (indicted by the subscript) using read and write on a data item x, denoted r (x) and w (x) respectively. Which one of them is conflict serializable?
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Consider the following four schedules due to three transactions (indicted by the subscript) using read and write on a data item x, denoted r (x) and w (x) respectively. Which one of them is conflict serializable?

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