摘要
与一般商用DBMS 不同,RDAS 的数据管理机制是针对统计分析和管理决策的特殊需要而设计的,同时它又不失为一个完整的关系式数据库管理系统,本文介绍该系统的主要特点和功能并指出其具有关系完备性,给出系统的逻辑结构和物理结构。着重论述实现过程中采取的若干策略:临时关系的生成及变换,完整性控制;缺损值处理。
Boing different from general DBMS,the RDAS data managemetmechanism is not only disigned directly to meet the special requirements of statisticalanalysis and management decision,but also to be a perfect relational databasemanagement sysbem.This paper introduces its main features and functions and showsits relational completeness.The logical and physical structures of the system are alsogiven.This paper focuses on some adopted strategies for implementation,thegeneration and transformation of temprorary relation,missing value processing,joinalgorithms and its optimization,the creation from the application and mainterancepoint of view.
出处
《计算机应用与软件》
CSCD
1989年第6期8-14,共7页
Computer Applications and Software
