In a database system using write-ahead logging, what is the worst-case number of disk accesses required to read a data item? Explain why this presents a problem to designers of real-time database systems.
Answer to relevant QuestionsExplain why it may be impractical to require serializability for long-duration transactions.Consider a multidatabase system in which every local site ensures local serializability, and all global transactions are read only.a. Show by example that nonserializable executions may result in such a system.b. Show how ...Consider the data in Exercise 15-2. Use the normal approximation for the sign test to test H0 = 8.5 versus H1 = 8.5, with a = 0.05. What is the P-value for this test?Use the normal approximation to the sign test for the data in Exercise 15-13. With a = 0.05, what conclusions can you draw?Consider the Rockwell hardness test data in Exercise 15-9. Assume that both distributions are continuous and use the Wilcox on signed-rank test to test that the mean difference in hardness readings between the two tips is ...
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