What is lock de-escalation, and under what conditions is it required why is it not required if the unit of data shipping is an item?
Answer to relevant QuestionsSuppose you were in charge of the database operations of a company whose main job is to process transactions. Suppose the company is growing rapidly each year, and has outgrown its current computer system. When you are ...Discuss the relative advantages of centralized and distributed databases.Consider a distributed system with two sites, A and B. Can site A distinguish among the following?• B goes down.• The link between A and B goes down.• B is extremely overloaded and response time is 100 times longer ...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 form of parallelism (interquery, interoperation, or intraoperation) is likely to be the most important for each of the following tasks?a. Increasing the throughput of a system with many small queriesb. Increasing the ...
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