政大機構典藏-National Chengchi University Institutional Repository(NCCUR):Item 140.119/69146
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    题名: Optimizing entity join queries when data transmission cost dominates
    作者: 陳良弼
    Tsai,Pauray S.M.;Chen,Arbee L.P.
    贡献者: 資科系
    关键词: Entity join;Extended semijoin;Inconsistent data;Local processing;Multidatabase;Query optimization;Query transformation;Selectivity
    日期: 1997-05
    上传时间: 2014-08-21 15:01:48 (UTC+8)
    摘要: Heterogeneities exist in a multidatabase environment. For example, a real world entity may be differently represented in relations of different databases. In particular, keys of these relations may be incompatible. In this paper, we consider processing entity join queries when data transmission cost dominates. An entity join operation ‘integrates’ tuples representing the same entities from different relations in which inconsistent data may exist. A natural way to process the entity join is to transmit both relations to a site, resolve the possible conflicts between corresponding attributes and process the join, which is very costly. In this paper, an approach is proposed to correctly transform a global query into local subqueries to preprocess entity join queries in multiple sites with an attempt to lower the cost of data transmission. Besides, an extension of the traditional semijoin, named extended semijoin, is proposed to further reduce the cost of data transmission for entity join query processing.
    關聯: Data & Knowledge Engineering (EI), North-Holland,283-308
    数据类型: article
    显示于类别:[資訊科學系] 期刊論文

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