How might a distributed database designed for a local-area network differ from one designed for a wide-area network?
Answer to relevant QuestionsWhen is it useful to have replication or fragmentation of data? Explain your answer.The persistent messaging scheme described in this chapter depends on timestamps combined with discarding of received messages if they are too old. Suggest an alternative scheme based on sequence numbers instead of timestamps.Consider a relation that is fragmented horizontally by plant-number:Employee (name, address, salary plant-number) assumes that each fragment has two replicas: one stored at the New York site and one stored locally at the ...What factors could result in skew when a relation is partitioned on one of its attributes by:a. Hash partitioningb. Range partitioningIn each case, what can be done to reduce the skew?What is the main reason why servlets give better performance than programs that use the common gateway interface (CGI), even though Java programs generally run slower than C or C++ programs?
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