Homework Answers
Answer:
Below is the given schedule for above question
| T1 | T2 | T3 |
|
sl-1(A) r1(A) |
||
|
sl-2(A) r2(A) |
||
|
sl-3(A) r3(A) |
||
|
sl-1(B) r1(B) |
||
|
sl-2(B) r2(B) |
||
| xl-2(B) | ||
|
xl-1(B) w1(B) w1(B) u1(B) u1(A) |
||
| xl-1(A) | ||
| xl-3(A) | ||
|
xl-2(A) w1(A) |
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Consider the following order of operation requests from transactions T1. T2. T3 r1 (A) r2 (A)...
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).
Question 5. (20pts) (Briefly justify your answer) 1) Consider three transactions: T1, T2 and T3. Draw...
Question 5. (20pts) (Briefly justify your answer) 1) Consider three transactions: T1, T2 and T3. Draw the precedence graph for the following schedule consisting of these three transactions and determine whether it is conflict serializable a) (5points) S: R1(X); R3(Z); W2(X); RI(Z); R3(Y); W2(Y), R3(Z), W1(Z), b) (5points) S: RI(X); R3(Z); W20x); RI(Y); R2(Y); W3(Y); R3(Z); WI(Z);
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
Consider the following transaction schedule: r1(X), r2(X), r3(X), r1(Y), w2(Z), r3(Y), w3(Z), w1(Y) This schedule is...
Consider the following transaction schedule: r1(X), r2(X), r3(X), r1(Y), w2(Z), r3(Y), w3(Z), w1(Y) This schedule is conflict-equivalent to some or all serial schedules. Determine which serial schedules it is conflict-equivalent to, and then identify a true statement from the list below. Select one: a. The schedule is conflict-equivalent to (T3, T1, T2) b. The schedule is not serial c. The schedule is conflict-equivalent to (T3, T2, T1) d. The schedule is conflict-equivalent to (T2, T3, T1) e. The schedule is...
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
-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,...
5. Consider the SPIM code below. globl main .text main: ori $t1, $0, 10 ori $t2,...
5. Consider the SPIM code below. globl main .text main: ori $t1, $0, 10 ori $t2, $0, 11 add $t3, $t1,$t2 move $t4, $t3 The following image shows a screen shot of QtSPIM page when this program is loaded, and executed in step-by step fashion. Current instruction is highlighted. Data Text x Text Regs Int Regs [16] Int Regs [16] PC = 400028 EPC 0 Cause = 0 BadAddr = 0 Status = 3000ff10 HI LO = 0 = 0...
Problem 3 Consider the following system: 2 213+w. where w denotes control input. Here we design a control system based on passivity. (a) Suppose that w =-r1 + x2 + 2.123 + u for a new control input u...
Problem 3 Consider the following system: 2 213+w. where w denotes control input. Here we design a control system based on passivity. (a) Suppose that w =-r1 + x2 + 2.123 + u for a new control input u. Show that the state equation can be written as the following cascade form: i fa(2) +F(z)y, 22u yT2, where z = [ri, r3]T e R2. Find the expression for fa (z) and F(z). (b) Show that when y0, the origin 0...
Consider a VEX-executing VLIW machine with the following characteristics: The machine supports 4 slots (4-wide machine)...
Consider a VEX-executing VLIW machine with the following characteristics: The machine supports 4 slots (4-wide machine) with the following resources: 2 memory units each with a load latency of 3 cycles 2 integer-add/sub functional units with a latency of 2 cycle 1 integer-multiply functional unit with a latency of 4 cycles Each functional unit in the machine is pipelined and can be issued a new operation at each cycle. However, the results of an operation are only available after the...
Question 5. (20pts) (Briefly justify your answer) 1) Consider three transactions: T1, T2 and T3. Draw the precedence graph for the following schedule consisting of these three transactions and determine whether it is conflict serializable a) (5points) S: R1(X); R3(Z); W2(X); RI(Z); R3(Y); W2(Y), R3(Z), W1(Z), b) (5points) S: RI(X); R3(Z); W20x); RI(Y); R2(Y); W3(Y); R3(Z); WI(Z);
5. Consider the SPIM code below. globl main .text main: ori $t1, $0, 10 ori $t2, $0, 11 add $t3, $t1,$t2 move $t4, $t3 The following image shows a screen shot of QtSPIM page when this program is loaded, and executed in step-by step fashion. Current instruction is highlighted. Data Text x Text Regs Int Regs [16] Int Regs [16] PC = 400028 EPC 0 Cause = 0 BadAddr = 0 Status = 3000ff10 HI LO = 0 = 0...
Problem 3 Consider the following system: 2 213+w. where w denotes control input. Here we design a control system based on passivity. (a) Suppose that w =-r1 + x2 + 2.123 + u for a new control input u. Show that the state equation can be written as the following cascade form: i fa(2) +F(z)y, 22u yT2, where z = [ri, r3]T e R2. Find the expression for fa (z) and F(z). (b) Show that when y0, the origin 0...
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