Transaction Processing Concepts, Concurrency and Recovery When do 2 operations c

Question

Transaction Processing Concepts, Concurrency and Recovery

When do 2 operations conflict? Do they have to occur on the same day? A. ? When they both access the same item; are from different transactions and one of them is a write. No. B. ? No. A non-committed transaction can conflict with a later transaction. C. ? When a write and read, delete and update occur at the same time. No. D. ? When one is a read and one is a write if the transaction is still running E. ? 1. actions belong to different transactions, the actions access the same data, (read or write) 2. yes they have to.

Explanation / Answer

Two operations conflict if:

1)They are by different transactions,

2)they are on the same object,

3)and at least one of them is a write.

so answer is first option(A)

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