Find W1,W2,T1 and T2. Suppose that the pulleys are frictionless and the system is in equlibrium...
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).
Consider the following order of operation requests from transactions T1. T2. T3 r1 (A) r2 (A) r3 (A) r1 (B) r2 (B) w1 (B) w2 (A) Show the resulting schedule table when we have a scheduler that supports shared exclusive, and update locks.
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...
find w1,w2 and w3
91 10。
91 10。
Transactions. Consider an ATM system. We have 2 transactions. T1: withdraw $50 and T2: withdraw $100. We consider concurrent executions of the transactions. Which schedule(s) is (are) serializable? Explain why. T2 reads the balance. T1 reads the balance. T2 withdraw $100. T1 withdraw $50. T2 reads the balance. T2 withdraw $100. T1 reads the balance. T1 withdraw $50. T2 reads the balance. T1 reads the balance. T2 withdraw $100. T1 withdraw $50.
Suppose T1 and T2 are iid Exp(1) a)What is the probability density function of T1 + T2? b)What is the probability that T1 + T2 ≥ 3?
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
2. A shaft supported by two bearings with 2 gears is indicated below W1-50 lb W2 100 lb The deflection at W1 is 0.0012 in The deflection at W2 is 0.0003 in Assume: a) Weight of the shaft is negligible Find the: 1) Critical Speed in RPM using the Rayleigh-Ritz equation
calculate the resolution in mm/min of the peaks below where t1
= 1.307, t2 = 1.603, W1 = 0.12 and W2= 0.13.
VWD: Signal A, 205 m mp 500 326m Retention Time Grad Pump Solvent Rati 6050 113 266 Grup: Seven Rai 05113265m GradPump: Flow mp SOS 3 2 Area C:\EZChrom Elite Enterprise Projects Default Datalmcid mp5050 f11.3 265nm.dat, WWD: Signal A, 265 nm
Find the angles θ1 and θ2 in the figure below, where w1 = 4.75
N, w2 = 8.40 N, w3 = 3.90 N, if all the weights are at
rest.
อ, 02 W3 W2 Wi