Transaction Processing Concepts, Concurrency and Recovery Suppose the system cra

Question

Transaction Processing Concepts, Concurrency and Recovery

Suppose the system crashes. What transactions must be undone? A. Any transaction that modifies must be undone. Also, any transaction that could read incorrect values, must be undone. B. Transactions that fail after recording some changes to the database, but have not committed yet must be undone. C. Undo changes from uncompleted transactions commit. D. Any transaction that was uncommitted at the time of the crash, if uncommitted writes are allowed. E. Any changed a value in the database that has been read

Explanation / Answer

D. Any transaction that was uncommited at the time of crash, if uncommitted writes are allowed.

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