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Subject : Databse Topic: 2pl locking protocol..... If the given schedule is allowed under any 2pl( basic 2pl,strict or rigorous) then it is also allowed in conflict serializble , so if the schedule which is allowed in conflict serializable then also we can say it will be allowed in 2pl?
Ashutosh_17
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Ashutosh_17
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hem chandra joshi
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Dec 6, 2017
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If there is cycle as shown in below figure . What will it be ? Conflict serializable or non conflict serializable
hem chandra joshi
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hem chandra joshi
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learncp
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Oct 7, 2015
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How is this schedule not allowed in Strict 2PL, but allowed in 2PL ?
$\begin{bmatrix} T1 &T2 \\ R(A) & \\ W(A)& \\ & R(A)\\ & W(A)\\ &R(B) \\ &W(B) \\ & Commit\\ Abort& \end{bmatrix}$ How is this schedule allowed in 2PL ? In 2PL ... phase in , which is not present in T2 ..? This example is given in the book by Raghu Ramkrishnan on page 529 and 552 (for reference)
learncp
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learncp
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mehul vaidya
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Jan 22, 2019
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Is there any example of schedule which is Strict but not serializable
I have gone through link https://stackoverflow.com/questions/40859477/is-a-strict-schedule-always-serializable But i don’t think example given there is correct.I don’t think it is strict schedule as T2 is reading x which is written by T1 , even before T1 commits. Hence is any other example which is strict but not serializable?
mehul vaidya
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mehul vaidya
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