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junaid ahmad
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Databases
Dec 21, 2018
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ANY EXAMPLE OF AN SCHEDULE WHICH IS RECOVERABLE BUT NOT CASCADLESS.?
transaction-and-concurrency
databases
concurrency
junaid ahmad
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Dec 21, 2018
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junaid ahmad
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Shubhgupta
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Dec 21, 2018
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There can be many because recoverable schedule is superset of cascadless schedule.
one example-
S: R1(x)R1(y)W1(x)R2(x)W2(x)W1(y)Commit1Commit2
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jayadev
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Transactions and concurrency control
When Ti attempts to write data item Q, if TS(Ti ) < w-timestamp(Q), then Ti is attempting to write an obsolete value of {Q}. Rather than rolling back Ti as the timestamp ordering protocol would have done, this {write} operation can be ... Ti any transaction which comes after the Ti will have a chance of reading that change made by Ti by performing Read(Q) .
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techbrk3
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Databases
Nov 9, 2017
1,666
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Consider a schedule with three transactions. T1, T2 and T3 executed concurrently.
The schedule is given below. Find out the category of the schedule S: R1(X),R2(Z)R1(Z),R3(X) W1(X) W3(Y) R2(Y) W2(Z) W2(Y) C1 C2 C3 Recoverable schedule Conflict Serializable Strict schedule None of these
techbrk3
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Nov 9, 2017
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techbrk3
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databases
transaction-and-concurrency
concurrency
1
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Shubhanshu
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in
Databases
Oct 22, 2017
413
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Transactions Serializable schedule and Unserializable Schedule
Some where I have read, that WR, RW, WW problem occurs only in un-serializable schedule, and Irrecoverable problem, cascade less rollback problem and lost update problems occur in serializable schedule. Is the above statement true or false?
Shubhanshu
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Oct 22, 2017
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Shubhanshu
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databases
transaction-and-concurrency
concurrency
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DebRC
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Databases
Aug 16, 2022
1,875
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Is a Serial Schedule always Recoverable?
Is only conflict serializable schedules are recoverable? Or both view as well as conflict serializable schedules are recoverable? I have been seeing different answers in different forum.
DebRC
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Aug 16, 2022
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DebRC
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databases
concurrency
transaction-and-concurrency
serializability
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