分布式数据流查询方案及优化

Query scheme and its optimization for distributed data stream

流式数据库系统是一种新型数据库系统,方便于执行连续数据流查询。许多基于流的应用都是分布式的,由于输入流速率及其他系统参数如可用的计算资源是易变的,所以一个流查询方案必须能适应这些变化。提出一种分布式流查询方案并进行了优化,使用元组响应时间及系统吞吐量来评价方案的性能。同时,通过实验和其他方案进行比较,证明了方案是最佳的。

Stream database system is a new type of database system designed to facilitate the execution of queries to continuous streams of data. Many stream-based applications are inherently distributed. Since input stream rates and other system parameters such as the amount of available computing resources can fluctuate significantly, a stream query plan must be able to adapt to these changes. This paper proposed a distributed stream query plan and optimized, and defined performance metrics for response time and system throughput. The experimental result proves that this plan is optimal compared with other plans.