分布式空间数据库中基于事务的客户端高速缓存技术研究

Transactional Client-Cache Techniques in Distributed Spatial Database

空间数据通过Intranet或Internet从服务器传送给客户端,由于涉及到大量的空间数据,繁重的网络传输可能成为系统的瓶颈。客户端高速缓存技术能较好的解决这个问题。论文提出了客户端缓冲技术应用在分布式空间数据系统中的体系结构;研究了基于重叠区域的客户端缓冲技术在分布式空间数据库中具体应用,并给出适合空间数据特点的缓冲置换算法;同时讨论了高速缓存技术相关高速缓冲一致性问题。

Spatial data is shipped to client through Internet or Intranet from server in distributed spatial database system. Heavy communications between client and server may become bottleneck because of high volume of spatial data. Client caching techniques can effectively solve the problem. In the paper we present the architecture of spatial database in which client cache technique will be applied. Then we give the method based on overlapped region,which is applied for spatial cache techniques. Replacement algorithms considering spatial data criteria are devised combined with conventional LRU algorithms. Cache consistency related to cache techniques is discussed in succession.