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Consider the following schedule for transactions T1, T2 and T3:
Q. Which one of the schedules below is the correct serialization of the above?
  • a)
    T1->>T3->>T2
  • b)
    T2->>T1->>T3
  • c)
    T2->>T3->>T1
  • d)
    T3->>T1->>T2
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
Consider the following schedule for transactions T1, T2 and T3:Q. Whic...
T1 can complete before T2 and T3 as there is no conflict between Write(X) of T1 and the operations in T2 and T3 which occur before Write(X) of T1 in the above diagram.
T3 should can complete before T2 as the Read(Y) of T3 doesn’t conflict with Read(Y) of T2. Similarly, Write(X) of T3 doesn’t conflict with Read(Y) and Write(Y) operations of T2.
Another way to solve this question is to create a dependency graph and topologically sort the dependency graph. After topologically sorting, we can see the sequence T1, T3, T2.
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Consider the following schedule for transactions T1, T2 and T3:Q. Which one of the schedules below is the correct serialization of the above?a)T1->>T3->>T2b)T2->>T1->>T3c)T2->>T3->>T1d)T3->>T1->>T2Correct answer is option 'A'. Can you explain this answer?
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