Consider amultithreaded process that deliversmessages froma durable queue of persistent messages. Different threads may run concurrently, attempting to deliver different messages. In case of a delivery failure, the message must be restored in the queue. Model the actions that each thread carries out as a multilevel transaction, so that locks on the queue need not be held till a message is delivered.
Answer to relevant QuestionsDiscuss the modifications that need to bemade in each of the recovery schemes covered in Chapter 17 if we allow nested transactions. Also, explain any differences that result if we allow multilevel transactions.The titanium content in an aircraft-grade alloy is an important determinant of strength. A sample of 20 test coupons reveals the following titanium content (in percent): 8.32, 8.05, 8.93, 8.65, 8.25, 8.46, 8.52, 8.35, 8.36, ...Two different types of tips can be used in a Rockwell hardness tester. Eight coupons from test ingots of a nickel based alloy are selected, and each coupon is tested twice, once with each tip. The Rockwell C-scale hardness ...Suppose that we take a sample of n = 10 measurements from a normal distribution with σ1. We wish to test H0: μ = 0 against H1: μ > 0. The normal test statistic is Zo = X/ (σ/√n), and we decide to ...Apply the Wilcox on signed-rank test to the measurement data in Exercise 15-12. Use a = 0.05 and assume that the two distributions of measurements are continuous.
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