Lec-82: Introduction to Serializability | Transactions Concurrency and Control | DBMS
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- Опубликовано: 8 сен 2024
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Serializability is the classical concurrency scheme. It ensures that a schedule for executing concurrent transactions is equivalent to one that executes the transactions serially in some order. It assumes that all accesses to the database are done using read and write operations.
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Consider the following schedule:
SCHEDULE: r1(P), w2(P), r3(P), r1(Q), r4(R), w2(Q), r1(S), w3(S), r4(S),
w4(Q), w5(Q), w5(R)
Is this given schedule conflict serializable? If yes, prepare a precedence graph and
write the order of execution for transactions? How to solve this question?
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Sir if a schedule is serializable then does that mean that we will convert the parallel schedule to serial actually? If yes then how will we get the benefits of parallel schedules and how will be get rid of drawbacks of serial schedules?
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