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

Jia Ling Koh, Arbee L P Chen

研究成果: 書貢獻/報告類型會議貢獻

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
主出版物標題Proceedings of the International Workshop on Research Issues in Data Engineering - Distributed Object Management -RIDE-DOM
發行者IEEE
頁面50-57
頁數8
出版狀態已發佈 - 1995
對外發佈Yes
事件Proceedings of the 5th International Workshop on Research Issues in Data Engineering-Distributed Object Management - Taipei, Taiwan
持續時間: 1995 三月 61995 三月 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95/3/695/3/7

ASJC Scopus subject areas

  • Computer Science(all)

指紋 深入研究「Mapping strategy for querying multiple object databases with a global object schema」主題。共同形成了獨特的指紋。

引用此