计算机应用

• 数据挖掘与软件过程技术 • 上一篇    下一篇

面向移动计算环境的单连接查询处理模式研究

王敏 朱玉全 张春芬   

  1. 江苏大学 江苏大学 江苏大学
  • 收稿日期:2007-05-28 修回日期:2007-07-18 发布日期:2007-11-01 出版日期:2007-11-01
  • 通讯作者: 王敏

Study on join query processing schemes in a mobile computing environment

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  • Received:2007-05-28 Revised:2007-07-18 Online:2007-11-01 Published:2007-11-01
  • Contact: Min WANG

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。

关键词: 移动计算, 连接查询, 数据传输, 能量消耗

Abstract: 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.

Key words: mobile computing, join query, data transmission, energy consumption