Mapping strategy for querying multiple object databases with a global object schema

Jia Ling Koh*, Arbee L.P. Chen

*此作品的通信作者

研究成果: 會議貢獻類型會議論文同行評審

6 引文 斯高帕斯(Scopus)

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 for the users to retrieve data. The mapping information between the global and component schemas is important for the 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 among a virtual class and its constituent classes. In addition, a mapping graph is used to describe the mapping equation. According to the mapping information, the mechanism to process global queries is introduced. One processing unit is responsible to decompose the global query into the subqueries against the component databases. Moreover, to handle the effects of schema restructuring, preprocessing and postprocessing units are provided for each local DBMS. Finally, the results returned from component databases need to be integrated. The certain result and maybe result for a global query are discussed. Also, the situation where a real-world entity is represented in different component databases as different objects is considered for the result integration.

原文英語
頁面50-57
頁數8
出版狀態已發佈 - 1995
對外發佈
事件Proceedings of the 5th International Workshop on Research Issues in Data Engineering-Distributed Object Management - Taipei, Taiwan
持續時間: 1995 3月 61995 3月 7

其他

其他Proceedings of the 5th International Workshop on Research Issues in Data Engineering-Distributed Object Management
城市Taipei, Taiwan
期間1995/03/061995/03/07

ASJC Scopus subject areas

  • 電腦科學(全部)

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