政大機構典藏-National Chengchi University Institutional Repository(NCCUR):Item 140.119/69152
English  |  正體中文  |  简体中文  |  全文笔数/总笔数 : 85800/114447 (75%)
造访人次 : 22920996      在线人数 : 96
RC Version 6.0 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
搜寻范围 查询小技巧:
  • 您可在西文检索词汇前后加上"双引号",以获取较精准的检索结果
  • 若欲以作者姓名搜寻,建议至进阶搜寻限定作者字段,可获得较完整数据
  • 进阶搜寻
    政大機構典藏 > 理學院 > 資訊科學系 > 期刊論文 >  Item 140.119/69152


    请使用永久网址来引用或连结此文件: http://nccur.lib.nccu.edu.tw/handle/140.119/69152


    题名: An Approach to Querying Multiple Object Databases
    作者: é™³è‰¯å¼¼
    CHEN,ARBEE L. P.
    KOH,JIA-LING
    贡献者: è³‡ç§‘ç³»
    关键词: object database;multidatabase system;schema mapping strategy;global query processing;object isomerism
    日期: 2002-03
    上传时间: 2014-08-21 15:09:08 (UTC+8)
    摘要: In a multidatabase system which consists of object databases, a global schema created by integrating schemas of the component databases provides a uniform interface and high level location transparency to help users retrieve data. The mapping between the global and component object schemas is complicated due to schema restructuring conducted to resolve various conflicts among component schemas before conducting schema integration. This mapping information is important for global query processing. In this paper, a mapping strategy is presented. A mapping equation is defined to denote the mappings for attributes and object instances between a virtual class and its constituent classes. In addition, a mapping graph is used to describe the mapping equation. Based on the mapping information, a mechanism for processing global queries in parallel is introduced. One processing unit is responsible for decomposing the global query into subqueries against the component databases. To handle the effects of schema restructuring, preprocessing and postprocessing units are also provided for each local DBMS. The results returned from component databases need to be integrated. The concept of object isomerism, where a real-world entity is represented by more than one object in different component databases, is considered for integrating query results.
    關聯: Journal of Information Science and Engineering (EI,SCIE),18(2),281-310
    数据类型: article
    显示于类别:[資訊科學系] 期刊論文

    文件中的档案:

    档案 描述 大小格式浏览次数
    281-310.pdf388KbAdobe PDF705检视/开启


    在政大典藏中所有的数据项都受到原著作权保护.


    社群 sharing

    著作權政策宣告
    1.本網站之數位內容為國立政治大學所收錄之機構典藏,無償提供學術研究與公眾教育等公益性使用,惟仍請適度,合理使用本網站之內容,以尊重著作權人之權益。商業上之利用,則請先取得著作權人之授權。
    2.本網站之製作,已盡力防止侵害著作權人之權益,如仍發現本網站之數位內容有侵害著作權人權益情事者,請權利人通知本網站維護人員(nccur@nccu.edu.tw),維護人員將立即採取移除該數位著作等補救措施。
    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - 回馈