摘要
本文研究了语义查询变换的逻辑基础,讨论了分布式数据库系统中语义变换的可能性和必要性,概括了应用领域中的一些语义信息,提出了一个基于启发式规则的分布式查询变换机制.
In order to reduce the processing cost of distributed queries to a greater extent, semantic query optimization is introduced. First, logic foundation of semantic query transformation is investigated. Then the possibility and necessity of semantic query transformations in distributed databases are discussed and some semantic information in application areas are summarized. At last, a distributed query transformation mechanism based on heuristic rules is proposed.
出处
《计算机学报》
EI
CSCD
北大核心
1991年第10期748-756,共9页
Chinese Journal of Computers
基金
国家自然科学基金
关键词
语义
查询
分布式
优化
数据库
Distributed query optimization, semantic equivalence, heuristic rules, query reduction.
