网状数据库
- 网络network database;DBTG;Network Model;GE IDS
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一个从网状数据库模式到关系数据库模式的转换算法
A conversion algorithm frcm DBTG schema to relation DBMS schema
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该系统采用VAX-11DBMS网状数据库技术,具有数据独立性、共享性、保密性和数据完整一致的特点。
This system uses VAX-11 network DBMS and has the features of data independence , data sharing , data security and data integrity .
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数据库技术经历了从层次数据库、网状数据库到关系数据库以及面向对象数据库的发展,已成为计算机信息系统中的重要基础和支柱,并在传统的商业和事务处理等领域内趋于成熟。
The technology of database develops from hiberarchy database , retiform database to relational database , even OO database , that has become to the base of information system .
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从时间上看,空间数据库技术的发展可以划分为四代:文件系统、层次或网状数据库、关系数据库、面向对象数据库。
As viewed from the time , The development on technology can be concluded to four periods : file system hiberarchy or network model database relational database and object oriented database .
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本文介绍了在网状型数据库IDMS上实现的安全技术和恢复数据库的过程。
In this article , the security and recovery techniques are introduced , which are implemented on a network data base-IDMS .