层次-关系型DBMS的实视图及其增量维护

Materialized Views for Layer Relation Structured Database and Incremental Maintenance

以对象交换模型作为中间模型，讨论了基于层次关系模型的视图机制，提出了一个增量维护的算法．该算法以统一的ＳＱＬ语句定义，维护混合模型上的视图，并提高地图应用系统的适应性．

With the object exchange model (OEM) as the intermediate model, the view mechanism is discussed based on the layer relation model. Incremental maintenance algorithms have been developed for either simple views and materialized views, so that the unified SQL statement definition can be used to give maintenance to the views on a hybrid model, and the adaptability of the application system of a map would be improved.