面向移动计算环境的连接查询处理模式  

Study on join query processing schemes in a mobile computing environment

作　　者：王敏[1] 陈耿[2] 朱玉全[1] 张春芬[1] 

机构地区：[1]江苏大学计算机科学与通信工程学院,江苏镇江212013 [2]南京审计学院信息管理系,南京210029

出　　处：《计算机应用》2007年第11期2756-2759,2765,共5页journal of Computer Applications

基　　金：国家自然科学基金资助项目(60572112);江苏省教育厅自然科学基金资助项目(06KJB120051)

摘　　要：在移动计算环境下,基于准确的操作代价估算结果来选择合适的连接查询处理模式,可以减少数据的传输量和移动设备的能量消耗。探讨了该环境下移动设备能量消耗的一个新的非对称特征,提出了一种操作代价估算方法,并从数据传输量和能量消耗两个方面对连接查询处理模式进行了代价估算和性能比较,提出了4个实用准则,以指导连接查询处理模式的选择。试验结果充分论证了估算方法和准则的正确性,且比现有同类估算模型和结论具有更加广泛的应用范围。Under a mobile computing environment, it can reduce both the amounts of data transmission and energy consumption of mobile units to select a suitable join query processing scheme based on accurate cost estimate of operations. A cost estimate method for join query processing was presented after a new asymmetrical feature of energy consumption at a mobile unit was exploited. The costs of join query processing schemes were evaluated from data transmission and energy consumption, and the performances of them were comparatively analyzed. Then four practical criteria were achieved to guide us to select the suitable processing scheme and minimize the cost of join operation. The experiments fully demonstrate that the estimate method and the criteria are reliable, and more applicable compared with the existing similar models and results.

关 键 词：移动计算 连接查询 数据传输 能量消耗 

分 类 号：TP311.13[自动化与计算机技术—计算机软件与理论]