What is the result of the schedule 'Sc: r1(X); w1(X); r2(X); r1(Y); w2(X); c2; a1'?
Understand the Problem
The question is asking about the characteristics of concurrency control in database transactions based on the given schedule. It requires an analysis of the operations and their order to determine the result regarding rollback and recoverability.
Answer
The schedule is not recoverable.
The schedule 'Sc: r1(X); w1(X); r2(X); r1(Y); w2(X); c2; a1' is not recoverable because transaction T2 reads X after T1 has written it and then commits, while T1 aborts.
Answer for screen readers
The schedule 'Sc: r1(X); w1(X); r2(X); r1(Y); w2(X); c2; a1' is not recoverable because transaction T2 reads X after T1 has written it and then commits, while T1 aborts.
More Information
A non-recoverable schedule allows a transaction to commit based on data from a tentative transaction that might abort, risking data consistency.
Tips
Confusing recoverable with non-recoverable schedules. Ensure transactions do not commit based on uncommitted data from other transactions.
Sources
- PDF - Transactions - course.ccs.neu.edu
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