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.
Answer to relevant QuestionsGive an example where the read one, write all available approach leads to an erroneous state.Consider the following deadlock-detection algorithm. When transaction Ti, at site S1, requests a resource from Tj, at site S3, a request message with timestamp n is sent. The edge (Ti, Tj, n) is inserted in the local ...For each of the three partitioning techniques, namely round-robin, hash partitioning, and range partitioning, give an example of a query for which that partitioning technique would provide the fastest response.Describe a good way to parallelize each of the following.a. The difference operationb. Aggregation by the count operationc. Aggregation by the count distinct operationd. Aggregation by the avg operatione. Left outer join, if ...Suppose the price of memory falls by half, and the speed of disk access (number of accesses per second) doubles, while all other factors remain the same. What would be the effect of this change on the 5 minute and 1 minute ...
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