【摘要】 本文对主题数据库之间的依赖关系进行了定义和说明,并细分其为实体依赖和操作依赖。在此基础上,对主题数据库之间的依赖关系进行了度量,提出了主题数据库之间的相对依赖度和相对被依赖度,并以此确定主题数据库的规模大小。最后给出了分解主题数据库算法的描述。通过这个算法可以把大规模的主题数据库科学地分解成若干个子主题数据库,降低子主题数据库之间的依赖度,同时又保证了主题数据库内部的联系是紧密的,大大提高了检索数据库的效率,并且有利于对主题数据库的管理和维护。更多还原

【Abstract】 The dependency among subject databases is defined and explained in this paper,and it is fractionated into en- tity dependency and operation dependency,then the subject database dependency relation is measured on this basic. The relative dependency and opposite among subject databases are proposed by which subject database scale can be af- firmed.Finally,the description of subdivision arithmetic is proposed through which large-scale subject database can be subdivided into certain subject databases.The depending degree among subject databases can be reduced and the inter- nal relation of subject database will be kept close simultaneously.So the retrieval efficiency to database will be enhanced greatly and it is advantageous to the subject database’s management and maintenance simultaneously.更多还原