Q37

MCQ2 marks, −0.67

Consider a schedule of transactions $T_1$ and $T_2$ : $\begin{array}{|c|c|c|c|c|c|c|c|c|c|c|} \hline T_1 & RA & & & RC & & WD & & WB & \text{Commit} & \\ \hline T_2 & & RB & WB & & RD & & WC & & & \text{Commit} \\ \hline \end{array}$ Here, RX stands for “Read(X)” and WX stands for “Write(X)”. Which one of the following schedules is conflict equivalent to the above schedule?

(A)

$\begin{array}{|c|c|c|c|c|c|c|c|c|c|c|} \hline T_1 & & & & RA & RC & WD & WB & & \text{Commit} & \\ \hline T_2 & RB & WB & RD & & & & & WC & & \text{Commit} \\ \hline \end{array} \\$

(B)

$\begin{array}{|c|c|c|c|c|c|c|c|c|c|c|} \hline T_1 & RA & RC &WD &WB & & & & & \text{Commit} & \\ \hline T_2 & & & & &RB & WB & RD& WC & & \text{Commit} \\ \hline \end{array} \\$

(C)

$\begin{array}{|c|c|c|c|c|c|c|c|c|c|c|} \hline T_1 & RA & RC & WD & & & & WB & & \text{Commit} & \\ \hline T_2 & & & & RB & WB & RD & & WC & & \text{Commit} \\ \hline \end{array} \\$

(D)

$\begin{array}{|c|c|c|c|c|c|c|c|c|c|c|} \hline T_1 & & & & & RA & RC & WD & WB & \text{Commit} & \\ \hline T_2 & RB & WB & RD & WC & & & & & & \text{Commit} \\ \hline \end{array}$

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