List three factors that need to be considered in query optimization for mobile computing that are not considered in traditional query optimizers.
Answer to relevant QuestionsDefine a model of repeatedly broadcast data in which the broadcastmedium is modeled as a virtual disk. Describe how access time and data-transfer rate for this virtual disk differ from the corresponding values for a typical ...If the entire database fits in main memory, do we still need a database system to manage the data? Explain your answer.Discuss 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.Consider the compressive strength data in Exercise 8-26.(a) Use the sign test to investigate the claim that the median strength is at least 2250 psi. Use a = 0.05. (b) Use the normal approximation to test the same hypothesis ...Use the normal approximation for the sign test for the data in Exercise 15-12. With a = 0.05, what conclusions can you draw?
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