Web仓储系统的视图刷新方案

1 Web仓储的时新性标准 WWW的迅猛发展使其成为全球信息传递与共享日益重要的信息资源。Web仓储使用物化视图构建信息集成系统,是对Web信息进行充分利用的一种有效方法。Web仓储具有高稳定性,查询速度非常快,非常适合决策分析等需要对信息进行深度加工的应用。与使用虚视图方法进行集成的系统不同,Web仓储系统中的首要任务是物化视图的构建和维护,而视图刷新则是物化视图维护工作的主体。

View-Refreshing Strategy in Web Repository

Web repository utilizes materialized views to integrate information,so the most important task for it is to refresh the views periodically to keep its vitality. The goal of view refreshing is to obtain the maximal system freshness, however, most of traditional standards do not consider query effect so that the corresponding view.refreshing scheme is usually inefficient. In this paper,we first bring forward a more reasonable standard for system freshness, thereafter make a comprehensive discussion upon system refreshing frequency, system resource allocation and view.refreshing order. After analyzing the effect and function to system freshness for each factor,we give a general strategy for materialized view refreshing.