面向对象的车站综合信息系统的查询优化策略

Query Optimization in Object Oriented MIS of Railway Station

针对面向对象的数据库（ＯＯＤＢ）的概括继承结构提出一种新的查询途径，它建立在一种对象表示的基础上。该对象表示由两部分组成：结构段和参考段，分别用于排除与目标查询类和预测查询类不相匹配的对象。性能分析表明该查询策略能显著降低磁盘Ｉ／Ｏ访问次数。

In this paper,a new query method which is based on generalization hierarchy in Object Oriented Database(OODB) is proposed. We suggest a sort of Object Signature which consists of the Structure Signature and the Reference Signature,eliminating respectively objects which do not match with target class and objects which do not match with predict class. We give performance analysis which indicates that this method can decrease the number of access on disk I/O.