In the following figure, you have two transaction T1 and T2, and the concurrent

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In the following figure, you have two transaction T1 and T2, and the concurrent execution is uncontrolled. Suppose that X=10, N=2, M=4. Show how the value of the X is changing during the execution, and explain what kind of problem the uncontrolled concurrent execution causes.In the following figure, you have two transaction T1 and T2, and the concurrent execution is uncontrolled. Suppose that X=10, N=2, M=4. Show how the value of the X is changing during the execution, and explain what kind of problem the uncontrolled concurrent execution causes.

T. T. 2 read item(X); read _item(X); Time write_item(X); read item(Y); write_ item(X); Y:= Y + N; write_ item(Y);

Explanation / Answer

Let us analyze the problems in the uncontrolled concurrent execution of the given schedule by looking at each operation with time. The initial values of X, N, M are 10, 2, 4 respectively.

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In the following figure, you have two transaction T1 and T2, and the concurrent

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