Web环境中的数据仓库维护

数据仓库作为一种对分布式信息源集成的关键技术而出现，WEB环境中信息源动态性的出现，对数据仓库方法提出了挑战，本文给出信息源的动态类型及其特点（数据更新、模式变化和约束调整）以及它们产生的原因，探讨了当考虑信息源变化的可能性时数据仓库的维护方法，包括从包装件，视图定义和数据仓库内容三个方面来适应信息源的变化，最后，探讨了EVE系统。

Maintaining Data Warehouses on Web Enviroments

Data warehouse have emerged as on key technology for the integration of distributed information sources. Challenging issues for data warehouse solutions arise due to the dynamicity of the information sources on Web environments. This article shows up the types of dynamicity(such as data updates,schema changes, and constraint modification)as well as their generation. This article also identifies maintaining for data warehousing systems that occurs when the possibility of information source changes is taken into consideration. Such maintaining includes adapting wrappers to information source changes, adapting view definition to changes,or adapting the data content of the data warehouse. Lastly, Evolvable View Environment(EVE) system is outlined.