关键词: 移动数据库, 实体化视图, 增量更新, 实时性, 新鲜度

Abstract: In mobile databases, data caching take the form of materialized views. Data is updated by communicating only the incremental part to reduce the demand for network bandwidth. But previous incremental update algorithms may be inefficient or cannot accomplish data update tasks when the wireless bandwidth drops dramatically. In the paper, a priority-based incremental update algorithm is proposed for real-time applications in mobile databases. The algorithm orders data items by dynamic freshness and transfers data to mobile computers according to the priority. The algorithm improves communication efficiency and data freshness when the wireless bandwidth is low and tends to vary widely.

Key words: mobile database, materialized view, incremental update, real-time, freshness