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    政大機構典藏 > 理學院 > 資訊科學系 > 期刊論文 >  Item 140.119/69374
    Please use this identifier to cite or link to this item: http://nccur.lib.nccu.edu.tw/handle/140.119/69374


    Title: Optimizing Multidatabase Queries by Query Transformation
    Authors: 陳良弼
    Chen,Arbee L. P.
    Contributors: 資科系
    Keywords: multidatabase systems;schema integration;data fragmentation;query modification;query transformation;query optimization;localized processing
    Date: 1991-06
    Issue Date: 2014-08-28 10:08:31 (UTC+8)
    Abstract: In a multidatabase system, schemas of the component databases are usually integrated into a global schema to provide users with transparencies on data distribution and schema differences. To process queries against the global schema, query modification, which maps the query into one against local schemas, is necessary. In this paper, an approach which transforms and decomposes the modified query into subqueries to optimize distributed query processing is presented. Each subquery references data contained at a local site and, therefore, can be locally processed. The partial results produced from these subquery executions are then collected to compute the query answer. This approach reduces query response time due to parallel processing. Moreover, queries which can actually be processed at a single site can be identified.
    Relation: Journal of Inforamtion Science and Engineering,7(2),279-296
    Data Type: article
    Appears in Collections:[資訊科學系] 期刊論文

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