移动查询缓存处理的研究

Mobile Query Through Semantic Cache

客户缓存为提高客户 /服务器数据库系统整体性能以及客户方数据可用性提供了有效途径 移动环境下网络资源的贫乏使客户缓存的作用更为重要 语义缓存是基于客户查询语义相关建立的一类缓存 提出一个基于语义缓存的客户缓存机制 ,给出缓存的内容组织 ,提出缓存项合并策略 ;然后讨论了基于语义缓存的查询处理策略 ;最后 ,模拟结果表明该客户缓存机制能够提高分布式、特别是移动环境下客户

Considering the resource-poor mobile devices and networks, the mobility of devices and the variance of network connections, information access in mobile environments faces many problems and challenges. Client caching provides a solution for ensuring data accessing performance in mobile environments. A mobile client caching scheme based on semantic caching is proposed, which explores the semantic locality among client issued queries. The cache is dynamically loaded with former query results, and is organized by cache item descriptions corresponding to query statements. Later queries are answered by cache items via cache description matching. First the content organization of semantic cache is presented; then how query can be derived from the cache is shown; to make the cache perform more efficiently, the merge policy among cache items are given. Then the query processing strategy based on semantic cache in a different situation is discussed. Finally, performance analysis results are shown, which validate the advantage of the caching scheme.