List three main features of mobile computing over wireless networks that are distinct from traditional distributed systems.
Answer to relevant QuestionsList three factors that need to be considered in query optimization for mobile computing that are not considered in traditional query optimizers.Like database systems, workflow systems also require concurrency and recovery management. List three reasons why we cannot simply apply a relational database system using 2PL, physical undo logging, and 2PC.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 ...Consider the data in Exercise 15-1. Use the normal approximation for the sign test to test H0: = 70 versus H0: 7.0. What is the P-value for this test? Consider the blood cholesterol data in Exercise 10-39. Use the sign test to determine whether there is any difference between the medians of the two groups of measurements, with a = 0.05. What practical conclusion would you ...
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