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PreviousConsider the following ordering schedule — S’ of transactions: `` T1 : R(A); T1 : A := A + 5; T1 : commit; T2 : R(B); T2 : B := B + 5; T3 : R(C); T3 : C := C + 5; T3 : C := C + 5; T4 : R(A); T4 : A := A + 5; T4 : R(D); T4 : D := D + 5; T4 : commit; T2 : commit; T3 : commit; ` Let the initial value of A = B = C = D = 0. The system follows log-based recovery process of *immediate database modification*. The assumption is the concurrency control system uses strict 2PL, and all transactions share a common disk buffer and single log. Explain what happens during the recovery process if a failure occurs at T2 : commit` statement.NextWrite a short note on any one of the foflowing: - (b) Database recovery