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Consider the given schedule and choose the suitable option.
S = T1:R(x), T1:R(y), T1:W(x), T2:R(y), T3:W(y), T1:W(x), T2:R(y)
S = T1:R(x), T1:R(y), T1:W(x), T2:R(y), T3:W(y), T1:W(x), T2:R(y)
- a)Schedule is view serializable
- b)Schedule is conflict serializable but not view serializable
- c)Schedule is view serializable but not conflict serializable
- d)Neither view serializable nor conflict serializable
Correct answer is option 'C'. Can you explain this answer?
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Most Upvoted Answer
Consider the given schedule and choose the suitable option.S = T1:R(x)...
Understanding the Schedule
The given schedule consists of three transactions: T1, T2, and T3, which perform read and write operations on variables x and y. The sequence of operations is as follows:
- T1 reads x
- T1 reads y
- T1 writes x
- T2 reads y
- T3 writes y
- T1 writes x
- T2 reads y
Conflict Serializable vs View Serializable
1. Conflict Serializable:
- A schedule is conflict serializable if it can be transformed into a serial schedule by swapping non-conflicting operations.
- In this schedule, T1 and T3 have conflicting operations on y (T3 writes y while T2 reads y), making it impossible to rearrange the schedule into a serial form without violating the conflict rules.
2. View Serializable:
- A schedule is view serializable if it maintains the same read and write operations as a serial schedule.
- In this case, T1 reads y before T2 reads y, and T3 writes y after T2 reads it. The final writes by T1 and T3 ensure that the results are consistent with a serial execution of T1 followed by T2 and then T3.
Conclusion
- Since the schedule can maintain the same view as a serial schedule through the sequence of reads and writes, it is view serializable.
- However, due to the conflicting operations, it cannot be rearranged into a serial schedule, thus it is not conflict serializable.
Thus, the correct answer is option 'C': the schedule is view serializable but not conflict serializable.
The given schedule consists of three transactions: T1, T2, and T3, which perform read and write operations on variables x and y. The sequence of operations is as follows:
- T1 reads x
- T1 reads y
- T1 writes x
- T2 reads y
- T3 writes y
- T1 writes x
- T2 reads y
Conflict Serializable vs View Serializable
1. Conflict Serializable:
- A schedule is conflict serializable if it can be transformed into a serial schedule by swapping non-conflicting operations.
- In this schedule, T1 and T3 have conflicting operations on y (T3 writes y while T2 reads y), making it impossible to rearrange the schedule into a serial form without violating the conflict rules.
2. View Serializable:
- A schedule is view serializable if it maintains the same read and write operations as a serial schedule.
- In this case, T1 reads y before T2 reads y, and T3 writes y after T2 reads it. The final writes by T1 and T3 ensure that the results are consistent with a serial execution of T1 followed by T2 and then T3.
Conclusion
- Since the schedule can maintain the same view as a serial schedule through the sequence of reads and writes, it is view serializable.
- However, due to the conflicting operations, it cannot be rearranged into a serial schedule, thus it is not conflict serializable.
Thus, the correct answer is option 'C': the schedule is view serializable but not conflict serializable.
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Community Answer
Consider the given schedule and choose the suitable option.S = T1:R(x)...
Since there is cycle found in precedence graph, it is not Conflict Serializable. Also, there is a blind write in T3 so we need to test further for view serializability using polygraph. From polygraph, we can derive that it is View serializable. Option (C) is Correct.
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Consider the given schedule and choose the suitable option.S = T1:R(x), T1:R(y), T1:W(x), T2:R(y), T3:W(y), T1:W(x), T2:R(y)a)Schedule is view serializableb)Schedule is conflict serializable but not view serializablec)Schedule is view serializable but not conflict serializabled)Neither view serializable nor conflict serializableCorrect answer is option 'C'. Can you explain this answer?
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Consider the given schedule and choose the suitable option.S = T1:R(x), T1:R(y), T1:W(x), T2:R(y), T3:W(y), T1:W(x), T2:R(y)a)Schedule is view serializableb)Schedule is conflict serializable but not view serializablec)Schedule is view serializable but not conflict serializabled)Neither view serializable nor conflict serializableCorrect answer is option 'C'. Can you explain this answer? for Computer Science Engineering (CSE) 2024 is part of Computer Science Engineering (CSE) preparation. The Question and answers have been prepared according to the Computer Science Engineering (CSE) exam syllabus. Information about Consider the given schedule and choose the suitable option.S = T1:R(x), T1:R(y), T1:W(x), T2:R(y), T3:W(y), T1:W(x), T2:R(y)a)Schedule is view serializableb)Schedule is conflict serializable but not view serializablec)Schedule is view serializable but not conflict serializabled)Neither view serializable nor conflict serializableCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Computer Science Engineering (CSE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Consider the given schedule and choose the suitable option.S = T1:R(x), T1:R(y), T1:W(x), T2:R(y), T3:W(y), T1:W(x), T2:R(y)a)Schedule is view serializableb)Schedule is conflict serializable but not view serializablec)Schedule is view serializable but not conflict serializabled)Neither view serializable nor conflict serializableCorrect answer is option 'C'. Can you explain this answer?.
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