基于语义的移动数据库的查询优化

Semantic-based Query Optimization for Mobile Database

在移动环境下,把大多数移动客户端用户频繁访问的数据(即热点数据)组织起来,以周期性的广播形式提供给移动客户端访问的数据广播技术是一种解决移动客户频断性的有效方法.移动数据的广播顺序直接影响移动查询的效率.为提高移动查询的效率,提出了基于语义顺序模型SOM、优化移动数据的广播顺序.

In a mobile environment,the broadcast paradigm has been recognized as an effective way to disseminate frequently requested information to multiple 'mobile clients'.In this paper,we show that to query the broadcast database efficiently,database items must be organized over the broadcast channel in a meaningful way.We define a cost model called the semantic ordering model for identifying the optimal organization of database items over the broadcast channel.