Query optimization in information integration for queries involving aggregation and group by

Wejdan Alkaldi, F. Sadri
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Abstract

This paper addresses the efficient processing of queries involving aggregation and group-by in the semantic-model approach to information integration. Query processing algorithms materialization, subqueries, and wrapper have been extended for such aggregate queries. Algorithms have been presented for two cases: In the first case information at different sources are disjoint, while in the second case information sources may contain overlapping information.
信息集成中涉及聚合和分组查询的查询优化
本文研究了信息集成的语义模型方法中涉及聚合和分组的查询的高效处理。针对这种聚合查询,查询处理算法物化、子查询和包装器得到了扩展。针对两种情况提出了算法:在第一种情况下,不同来源的信息是不相交的,而在第二种情况下,信息源可能包含重叠信息。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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