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Semantic cache schema for query processing in mobile databases

机译:移动数据库中查询处理的语义缓存架构

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Wireless technology and its beneficial applications encourage users to use PDA, laptop, cell phone, etc to access data anytime and anywhere. In mobile database systems as a distributed system extra problems such as location dependent queries, validity of results are mooted. Semantic cache is of the best solutions proposed for query processing in which data and its semantic description are cached in the client system. Existing semantic cache schemas are not capable to answer all type of queries and there is a need for such a solution. In this paper, an exhaustive semantic cache schema is presented that is able to answer all type of queries such as join and group by. It uses query graph model to achieve this goal. In this schema, as a semantic cache schema, structure of cache items based on query graph model, cache management algorithm and also cache items replacement algorithm are proposed. Simulation results show that using this schema improves performance of query processing in mobile database systems in term of response time, required bandwidth and also number of connections to the server.
机译:无线技术及其有益应用程序鼓励用户使用PDA,笔记本电脑,手机等访问数据,随时随地访问数据。在移动数据库系统中作为分布式系统额外问题,如位置相关查询,结果有效期。语义缓存是用于查询处理的最佳解决方案,其中数据及其语义描述在客户端系统中缓存。现有的语义缓存模式无法回答所有类型的查询,并且需要这样的解决方案。在本文中,提出了一种详尽的语义缓存架构,其能够回答所有类型的查询,例如加入和组。它使用查询图模型来实现这一目标。在该模式中,作为语义缓存模式,提出了基于查询图模型的高速缓存项的结构,提出了高速缓存管理算法以及高速缓存项替换算法。仿真结果表明,使用此模式可提高移动数据库系统中的查询处理的性能,以响应时间,所需的带宽以及与服务器的连接数量。

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