Question: Databases System. The complete book: Exercise 18.3.3 For each of the following schedules: a) r 1 (A); r2 (A); r3 (B); w 1 >i(A); r2

Databases System. The complete book: Exercise 18.3.3 For each of the following schedules:

a) r₁(A); r2 (A); r3 (B); w₁>i(A); r2 (C); r2 (B); w2 (B); W₁(C);

b) r₁(A); W₁(B); r₂(B): w2 (C); r3 (C); w3 (A);

d) r₁(A); r2 (A); w₁(B); w2 (B); r₁ (B ); r₂(B); w2 (C); w₁(D).

Assume that each transaction takes a lock on each database element immediately before it reads or writes the element, and that each transaction releases its locks immediately after the last time it accesses an element. Question: Tell what the locking scheduler would do with each of these schedules; i.e., what requests would get delayed, and when would they be allowed to resume?

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