数据库中介系统中面向对象视图查询的基于计算的转换

Proceedings. 3rd IFCIS International Conference on Cooperative Information Systems (Cat. No.98EX122) Pub Date : 1998-08-20 DOI:10.1109/COOPIS.1998.706200

V. Josifovski, T. Risch

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引用次数: 4

摘要

面向对象(OO)视图的概念一直是一种流行的数据集成方法。然而，关于在集成OO视图上优化查询的报告结果很少。在AMOS数据库中介系统的基础上，开发了面向对象的数据集成视图系统。本文描述了一个系统架构和实现，它利用查询优化技术来提高对集成OO视图的查询性能。该系统的主要特点是:1)保持数据源自治的被动中介框架。2)选择性物化机制，最小化物化视图对象的数量。3)基于谓词的机制，以保证物化视图对象的有效性以及对视图查询的完整性。为了减少被动视图集成的开销，他们在进行查询分解和基于成本的代数优化之前，使用廉价的基于演算的转换来生成最小的查询表达式。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Calculus-based transformations of queries over object-oriented views in a database mediator system

The concept of object-oriented (OO) views has been a popular approach to data integration. Nevertheless, there have been few reported results on optimization of queries over integrated OO views. The authors have developed an OO view system for data integration based on the AMOS database mediator system. The paper describes a system architecture and implementation that takes advantage of query optimization techniques to improve the performance of queries to integrated OO views. The main features of the system are: 1) a passive mediation framework that preserves the autonomy of the data sources. 2) A selective materialization mechanism that minimizes the number of materialized view objects. 3) A predicate based mechanism to guarantee the validity of the materialized view objects as well as the completeness of queries to the view. In order to reduce the overhead of the passive view integration, they use inexpensive calculus based transformations to generate minimal query expressions before the query decomposition and the cost-based algebraic optimization take place.

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Proceedings. 3rd IFCIS International Conference on Cooperative Information Systems (Cat. No.98EX122)

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