Distributed Database Design
Distributed database design refers to the following problem: given a database and its workload, how should the database be split and allocated to sites so as to optimize certain objective function (e.g., to minimize the resource consumption in processing the query workload). There are two issues: (i) data fragmentation which determines how the data should be fragmented and (ii) data allocation which determines how the fragments should be allocated. While these two problems are interrelated, the two issues have traditionally been studied independently, giving rise to a two-phase approach to the design problem.
The design problem is applicable when a distributed database system has to be built from scratch. In the case when multiple existing databases are to be integrated (e.g., in multi-database context), there is no design issue.
In a distributed database system, relations are...
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