专家数据库系统中知识导向的查询处理

Sang-goo Lee, L. Henschen, G. .. Qadah
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引用次数: 2

摘要

可以通过使用语义知识来提高数据库查询答案的质量,专家在回答查询时会使用这种知识。提出了一个能够在演绎数据库范例中利用这种专家知识的系统。对给定的查询进行重新表述,以降低评估成本,在最短的时间内生成答案子集,和/或生成一组好的答案。语义知识由一组Horn子句表示,其中使用了一些特殊的谓词。定义了某些知识与查询相关的情况,并给出了识别这些情况的方法。作者提出了语义知识的使用方法和不准确知识的回溯方案。
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Knowledge-directed query processing in expert database systems
The quality of an answer to a database query can be enhanced by utilizing semantic knowledge such that an expert would use if he/she were to answer the query. A system capable of utilizing such expert knowledge in a deductive database paradigm is presented. A given query is reformulated to reduce the cost of evaluation, to generate a subset of answers in the shortest amount of time, and/or to generate the set of good answers. Semantic knowledge is represented by a set of Horn clauses where a number of special predicates are used. The situations in which certain knowledge becomes relevant to a query are defined, and a method of identifying these situations is given. The authors present the ways in which semantic knowledge can be used and a backtracking scheme for inaccurate knowledge.<>
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