摘要
目前,数据库管理系统已经成为数据库技术中的核心技术,同时也是信息化建设中应用最广泛的软件。如今的数据库管理技术呈现出标准化、网络化、大型化和智能化的趋势。国外数据库管理系统由于研究的时间比较早,其技术比较先进。我国虽然也自主研发了一些数据库管理系统,但是和国外的产品相比还有一定的差距。本文以国产数据库管理系统OSCAR为例,重点阐述了查询优化的一些关键技术和具体实现方法。
At present, the database management system database technology has become a core technology, but also the information construction of the most widely used software. Today＇s database management technology presents standardized, network, large-scale and intelligent trend. Since the study abroad DBMS time earlier, its technology more advanced, even though China has also independently developed a number of database management systems, and foreign products, but there is still a gap. In this paper, the domestic database management system OSCAR, for example, focuses on a number of key technologies and specific method for query optimization
关键词
数据库管理系统
查询优化
选择性因子
关键技术
database management system
query optimization
selectivity factor
key technologies
