广域传感器数据库中的缓存技术研究

摘要

广域传感器数据库是当前国际上备受关注的由多学科高度交叉的新兴热点研究领域。广域传感器数据库具有巨大的应用价值，应用前景十分广阔。基于缓存技术和预取技术，提出了一种缓存技术与预取技术相结合的体系结构。对体系结构中各个模块的功能和实现算法进行了详细阐述，对算法进行了复杂性和实例分析，有效地解决了广域传感器数据库系统中，低频结点数据进入缓存替换出高频结点数据所造成的缓存命中率低和系统资源浪费问题。%Wide area sensor database is the current international concerns and the interdisciplinary emerging hot research field, it has very broad application prospect and great application value. Based on combination of the caching with prefetching technology, a system structure is put forward, the function and the algorithm of each module in the system structure is set forth,and the complexity of the algorithm is analysed with the example. The problem of low hit ratio and the waste of system resources in wide area sensor database, that is caused by the high frequency node data be replaced when the low frequency node data get into the cache, is effectively solved.