| 摘要: |
| 查询优化一般分为逻辑和物理两层，但两者密切相关．在一个具体系统的实现中，若把它们截然分开会影响优化效果，而把它们有机结合起来则更佳．本文在联系代数的基础上探讨该问题，综合考虑了逻辑与物理２个方面，给出了面向对象数据库系统中的查询优化算法. |
| 关键词: 面向对象数据库 联系代数 查询优化 |
| DOI： |
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| QUERY OPTIMIZATION IN OBJECT ORIENTED DATABASE SYSTEMS |
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WU Shengli,WANG Nengbin
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| Abstract: |
| Query optimization traditionally involves two deeply connected levels that are qualified as logical and physical. In the implementation of a concrete system, dividing it in two completely is not a good way. Considering the problem comprehensively is much better , the authors discuss this in the paper based on association algebra, and give query optimization algorithms in object oriented database system which taking into account both logical and physical aspects. |
| Key words: Object oriented database association algebra query optimization |
