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Database Management SystemConsider the schedule: R1(X), R2(X), W1(X), W2(X). The schedule is: (i) View serializable only (ii) Conflict serializable (iii) Not serializable (iv) Recoverable20252mDATABASE MANAGEMENT SYSTEMConsider 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.202114mDatabase Management SystemConsider the three transactions T1, T2, and T3, and the schedules S1 and S2 given below. State whether each schedule is serializable or not. If a schedule is serializable, write down the equivalent serial schedule(s). T1: r1 (X); r1 (Z); w1 (X); T2: r2 (Z); r2 (Y); w2 (Z); w2 (Y); T3: r3 (X); r3 (Y); w3 (Y); S1: r1 (X); r2 (Z); r1 (Z); r3 (X); r3 (Y); w1 (X); w3 (Y); r2 (Y); w2 (Z); w2 (Y); S2: r1 (X); r2 (Z); r3 (X); r1 (Z); r2 (Y); r3 (Y); w1 (X); w2 (Z); w3 (Y); w2 (Y);20247mProfessional Skill DevelopmentWhat is a schedule?20222m
PreviousConsider the following schema for institute library: Student (RollNo, Name, Father_Name, Branch) Book (ISBN, Title, Author, Publisher) Issue (RollNo, ISBN, Date-of-Issue) Write the following queries in SQL and relational algebra: (i) List roll number and name of all students of the branch 'CSE'. (ii) Find the name of student who has issued a book published by 'ABC' publisher. (iii) List title of all books and their authors issued to a student 'RAM'. (iv) List title of all books issued on or before December 1, 2020. (v) List all books published by publisher 'ABC'NextConsider the three transactions T1, T2, and T3, and the schedules S1 and S2 given below. State whether each schedule is serializable or not. If a schedule is serializable, write down the equivalent serial schedule(s). T1: r1 (X); r1 (Z); w1 (X); T2: r2 (Z); r2 (Y); w2 (Z); w2 (Y); T3: r3 (X); r3 (Y); w3 (Y); S1: r1 (X); r2 (Z); r1 (Z); r3 (X); r3 (Y); w1 (X); w3 (Y); r2 (Y); w2 (Z); w2 (Y); S2: r1 (X); r2 (Z); r3 (X); r1 (Z); r2 (Y); r3 (Y); w1 (X); w2 (Z); w3 (Y); w2 (Y);
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