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← GATE CSE 2014 Set 2

Q29

MCQ2 marks, −0.67

Consider the following schedule S of transactions T1,T2,T3,T4:T1, T2, T3, T4:

T1T2T3T4Reads(X)Writes(X)CommitWrites(X)CommitWrites(Y) Reads(Z)CommitReads(X)Reads(Y)Commit{\begin{array}{|l|l|l|l|}\hline \textbf{T1}& \textbf{T2}& \textbf{T3}& \textbf{T4} \\\hline & \text{Reads(X)} \\ && \text{Writes(X)} \\ && \text{Commit} \\ \text{Writes(X)} \\ \text{Commit}& \\ & \text{Writes(Y) } \\ & \text{Reads(Z)} \\ & \text{Commit} \\ &&& \text{Reads(X)} \\ &&& \text{Reads(Y)} \\ & &&\text{Commit} \\\hline \end{array}}

Which one of the following statements is CORRECT?

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