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APPROXIMATE-a query processor that produces monotonically improving approximate answers

机译:APPROXIMATE-一种查询处理器,可单调改善近似答案

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APPROXIMATE, a query processor that makes approximate answers available if part of the database is unavailable, or if there is not enough time to produce an exact answer, is described. The processor implements approximate query processing, and the accuracy of the approximate result produced improves monotonically with the amount of data retrieved to produce the result. The monotone query processing algorithm of APPROXIMATE works within a standard relational algebra framework. APPROXIMATE maintains semantic information for approximate query processing at an underlying level, and can be implemented on a relational database system with little change to the relational architecture. It is shown how APPROXIMATE is implemented to make effective use of the semantic support. The additional overhead required by APPROXIMATE is described.
机译:描述了一种查询处理器APPROXIMATE,如果数据库的一部分不可用,或者如果没有足够的时间产生准确的答案,则该查询处理器将提供近似的答案。处理器执行近似查询处理,并且所产生的近似结果的准确性随为产生结果而检索到的数据量单调提高。 APPROXIMATE的单调查询处理算法在标准关系代数框架内工作。 APPROXIMATE维护语义信息,以便在底层进行近似查询处理,并且可以在关系数据库系统上实现而对关系体系结构的更改很少。它显示了如何实现APPROXIMATE以有效利用语义支持。描述了APPROXIMATE所需的额外开销。

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