Question: Consider the three transactions T 1 , T 2 , and T 3 , and the schedules S 1 and S 2 given below. Draw

Consider the three transactions

T 1, T 2,

and

T 3,

and the schedules

S 1

and

S 2

given below. Draw the serializability

(

precedence

)

graphs for

S 1

and

S 2,

and state whether each schedule is conflict serializable or not. If a schedule is conflict serializable, check whether they are conflict equivalent or not and determine whether each schedule is strict or cascadeless schedule or both.

T 1

r 1 (X)

;

r 1 (Z)

;

w 1 (X)

;

T 2

r 2 (Z)

;

r 2 (Y)

;

w 2 (Z)

;

w 2 (Y)

;

T 3

r 3 (X)

;

r 3 (Y)

;

w 3 (Y)

;

S 1

r 1 (X)

;

r 2 (Z)

;

r 1 (Z)

;

r 3 (X)

;

r 3 (Y)

;

w 1 (X)

;

w 3 (Y)

;

r 2 (Y)

;

w 2 (Z)

;

w 2 (Y)

;

S 2

r 1 (X)

;

r 2 (Z)

;

r 3 (X)

;

r 1 (Z)

;

r 2 (Y)

;

r 3 (Y)

;

w 1 (X)

;

w 2 (Z)

;

w 3 (Y)

;

w 2 (Y)

;

Consider the three transactions T 1 , T 2 , and T

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