一个面向对象数据库系统的研究与实践

RESEARCH AND PRACTICE OF AN OBJECT-ORIENTED DATABASE SYSTEM

本文介绍了一个适用于ＣＩＭＳ、ＣＡＤ、ＡＩ和ＧＩＳ等领域的面向对象数据库系统ＷＨＹＭＸ．ＷＨＹＭＸ给出了聚合规范化和概括规范化的理论描述，提出了复杂对象的并发控制策略、存贮管理策略和对象管理方法．它支持嵌套事务处理和大对象的存贮管理．它在对象描述层下面增加了基于元组和面向值的操作，从而把面向对象模型与关系模型有机地结合在一起．

This paper introduces WHYMX object-oriented data base system suitablefor a certain of domains such as CIMS, CAD, Al and GIS. WHYMX gives the theoreticaldescription of aggregation and generalization standardization, presents the concurrencecontrol strategy, the storage management strategy and the object management mechanismof complex objects. WHYMX supports nested transaction and management of large storage object. WHYMX adds the operations of tuple--based and value--oriented in the objectdescription. Therefore, it has many advantages of the object--oriented data model and therelation data model.