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?
Homework Answers
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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)...
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);...
For the system given in figure 3 identify if schedule 2 is conflict equivalent and view...
For the system given in figure 3 identify if schedule 2 is conflict equivalent and view equivalent to schedule 1. Give proper reasons for you answer. Resolve the issues in schedule 2 by adopting appropriate locking scheme and apply deadlock prevention scheme to ensure prevention of deadlocks and starvation. (7) Table 2:Serial Schedule 1 T1 T2 T3 T4 T5 Read(X) Read(Z) Read(Y) Write(Z) ...
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).
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).
Q2 [10 pts] Given the following schedule Check the following: T2 RID) T1 T3 R(D) R(C)...
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?
4. R(A, B, C, D, E, F, G, H, I, J) where A → B, C,...
4. R(A, B, C, D, E, F, G, H, I, J) where A → B, C, D BE F→ G, H, I (A, F) → B, C, D, E, G, H, I, J For each of the following relations, normalize it into a set of BCNF relations.
Q3: Given a relational schema R = {A,B,C,D,E,F,G,H,1,J,K} and a set of functional dependencies F {A...
Q3: Given a relational schema R = {A,B,C,D,E,F,G,H,1,J,K} and a set of functional dependencies F {A B C D E, E F G H I J,AI →K} and a key(R) = AI = 1. Is R in BCNF? If yes, justify your answer [5 points] 2. If no, explain why and decompose R for two levels only [10 points] 3. Check whether the decomposition in step 2 dependency preserved or not [5 points]
- A. B. C. D. E. F. G. H. I. J. K. ...
- A. B. C. D. E. F. G. H. I. J. K. L. M. N. O. Telecommuting - A. B. C. D. E. F. G. H. I. J. K. L. M. N. O. Change - A. B. C. D. E. F. G. H. I. J. K. L. M. N. O. Job Sharing - A. B. C. D. E. F. G. H. I. J. K. L. M. N. O. Job Redesign - A. B. C. D. E. F. G. H. I. ...
a=12m b=13m c=17m T1=549(N.m) e=0.10(rad) d=100mm G=16Gpa Q2) The solid shaft having a diameter d is...
a=12m b=13m c=17m T1=549(N.m)
e=0.10(rad) d=100mm G=16Gpa
Q2) The solid shaft having a diameter d is fixed at end D. For a given rotation angle at C (clockwise when viewed from right side), denoted by e, and applied torque T1, determine the torque T2 if a- While end A is free allowed to rotate). b- While end A is fixed C- Also, Calculate shear stress at segments BC while end A is fixed. We were unable to transcribe this image
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?
4. R(A, B, C, D, E, F, G, H, I, J) where A → B, C, D BE F→ G, H, I (A, F) → B, C, D, E, G, H, I, J For each of the following relations, normalize it into a set of BCNF relations.
Q3: Given a relational schema R = {A,B,C,D,E,F,G,H,1,J,K} and a set of functional dependencies F {A B C D E, E F G H I J,AI →K} and a key(R) = AI = 1. Is R in BCNF? If yes, justify your answer [5 points] 2. If no, explain why and decompose R for two levels only [10 points] 3. Check whether the decomposition in step 2 dependency preserved or not [5 points]
a=12m b=13m c=17m T1=549(N.m)
e=0.10(rad) d=100mm G=16Gpa
Q2) The solid shaft having a diameter d is fixed at end D. For a given rotation angle at C (clockwise when viewed from right side), denoted by e, and applied torque T1, determine the torque T2 if a- While end A is free allowed to rotate). b- While end A is fixed C- Also, Calculate shear stress at segments BC while end A is fixed. We were unable to transcribe this image
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