![Q2 [10 pts] Given the following schedule Check the following: T2 RID) T1 T3 R(D) R(C) WO)) R(C) WO)) commit commit commit a. Is this schedule serializable? b. Is this schedule recoverable? c. Is this schedule cascadeless?](http://img.homeworklib.com/questions/7f212cf0-ab70-11eb-8288-7d2fe2b3fe6b.png?x-oss-process=image/resize,w_560)
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Q2 [10 pts] Given the following schedule Check the following: T2 RID) T1 T3 R(D) R(C)...
Consider the following schedule that performs actions taken by transactions T1 and T2 on database objects...
Consider the following schedule that performs actions taken by transactions T1 and T2 on database objects A and B : T1: S(A), R(A), X(B), U(A), R(B),W(B), Commit: U(B) T2: S(B), R(B), X(A), U(B), R(A), W(A), Commit: U(A) Because Strict 2PL is using, this schedule is guaranteed to be conflict serializable. A: True B:False
Four transactions are presently running: (The abbreviation R(A) means Read(A), and so on) • T1: R(A),R(B),R(J),W(A),W(B),R(D),R(E),R(G)...
Four transactions are presently running: (The abbreviation R(A) means Read(A), and so on) • T1: R(A),R(B),R(J),W(A),W(B),R(D),R(E),R(G) • T2: R(C),R(G),W(C),R(H),W(H),R(D) • T3: W(J),R(C),W(C) • T4: R(G),W(D),R(J) The following is a schedule for these transactions. T1:R(A), T4:R(G), T3:W(J), T1:R(B), T1:R(J), T1:W(A), T3:R(C), T3:W(C), T2:R(C), T2:R(G), T1:W(B), T1:R(D), T2:W(C), T1:R(E), T1:R(G), T2:R(H), T2:W(H), T4:W(D), T4:R(J), T2:R(D) 1. List all conflicts in these transactions. 2. Is the schedule conflict serializable? If it is, to which serial schedule(s) is it equivalent?
You are given with the following schedule, that consists of three transactions (T1, T2, T3) and...
You are given with the following schedule, that consists of three transactions (T1, T2, T3) and three database elements (A, B and C) w3(A); r1(A); w1(B); r2(B); w2(C); r3(C) a) Identify all the conflicts (as defined in Section 18.2.1 in the book). Hint: draw a bipartite graph between transactions and elements, as done in class b) Draw a precedence graph (as defined in Section 18.2.2 in the book). Is the schedule conflictserializable? Justify your answer
Q5: In DBMS, a graph precedence is used to test whether a schedule of concurrent transactions...
Q5: In DBMS, a graph precedence is used to test whether a schedule of concurrent transactions is conflict serializable or not. Given the following schedule S with three transactions T T3 T2 read(A) read(B) write(A) read(A) write(B) write(A) read(B) write(B) 1. Draw the precedence graph for the schedule S (5 points) 2. Check whether the schedule S conflict serializable or not (5 points] 3. Is it possible to construct a serial schedule S'which is conflict equivalent to the schedule S?...
Consider the following schedule. The actions are prefixed with the transaction name and are listed in...
Consider the following schedule. The actions are prefixed with the transaction name and are listed in the order they’re scheduled. S: T2:R(Y), T1:R(X), T1:W(X), T3:R(Y), T3:W(X), T1:W(Z), T2:R(X), T3:R(Z) a. Draw the dependency graph for S. b. Is S serializable? c. Is S conflict serializable? If so, what is the conflict equivalent serial schedule?
SQL question Consider the three transactions T1, T2 and T3, and the schedules S1, S2, S3...
SQL question Consider the three transactions T1, T2 and T3, and the schedules S1, S2, S3 and S4 given below. Which of the schedules is (conflict) serializable? The subscript for each database operation in a schedule denotes the transaction number for that operation. For each schedule, show all conflicts, draw the precedence graph, determine and write down if it is serializable or not, and the equivalent serial schedules if exist. T1: r1(x); w1(x); T2: r2(x); T3: r3(x); w3(x); S1: r1(x);...
2. Given the following three transactions T1 = r1(x); w1(y); T2 = r2(z); r2(y); w2(y); w2(x); T3 ...
2. Given the following three transactions T1 = r1(x); w1(y); T2 = r2(z); r2(y); w2(y); w2(x); T3 = r3(z); w3(x); r3(y); Consider the schedule S = r1(x); r3(z); r2(z); w3(x); r2(y); r3(y); w2(y); w1(y); w2(x); a. Draw the precedence graph of schedule S, and label each edge with data item(s). b. Based on the precedence graph, determine whether S is conflict serializable and justify your answer. If it is serializable, specify all possible equivalent serial schedule(s).
There are two sites s1 and s2 and three transactions T1, T2, T3. The time table...
There are two sites s1 and s2 and three transactions T1, T2, T3. The time table is as follows S1 S2 t1: (T1, W, a) (T3,W, b) t2: (T2, R, b) (T1, R, b) t3: (T1, R, a) t4: (T2, R, c) t5: (T3, R, c) Is there any deadlock in this distributed processing? Why?
-Advanced Database- Consider the following transaction schedule, where time increases from top to bottom. T1 T2...
-Advanced Database- Consider the following transaction schedule, where time increases from top to bottom. T1 T2 T3 T4 Read (X) Read(Y) Read(Z) Read(Y) Write(Y) Write(Z) Read(U) Read(Y) Write(Y) Read(Z) Write(Z) Read(U) Write(U) Answer the following questions: Draw the precedence graph of the above schedule. Is this schedule conflict serializable? If yes, show what serial schedule(s) it is equivalent to. If not, explain why. Is this schedule view serializable? If yes, show what serial schedule(s) it is equivalent to. If not,...
2. Given the following three transactions T1 = r1(x); w1(y); T2 = r2(z); r2(y); w2(y); w2(x);...
2. Given the following three transactions T1 = r1(x); w1(y); T2 = r2(z); r2(y); w2(y); w2(x); T3 = r3(z); w3(x); r3(y); Consider the schedule S = r1(x); r3(z); r2(z); w3(x); r2(y); r3(y); w2(y); w1(y); w2(x); a. Draw the precedence graph of schedule S, and label each edge with data item(s). b. Based on the precedence graph, determine whether S is conflict serializable and justify your answer. If it is serializable, specify all possible equivalent serial schedule(s).
Q5: In DBMS, a graph precedence is used to test whether a schedule of concurrent transactions is conflict serializable or not. Given the following schedule S with three transactions T T3 T2 read(A) read(B) write(A) read(A) write(B) write(A) read(B) write(B) 1. Draw the precedence graph for the schedule S (5 points) 2. Check whether the schedule S conflict serializable or not (5 points] 3. Is it possible to construct a serial schedule S'which is conflict equivalent to the schedule S?...
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