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持久对象框架中基于多级访问模式的对象预取技术研究与实现

Research and Implementation of Multi-level Access Pattern-based Prefetching in Persistent Object Framework
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摘要 在基于关系数据库和对象关系映射的持久对象框架中,对象之间通常通过对象引用和各种集合属性将对象相互关联起来,组合成更为复杂的复合对象。应用程序对这些复合对象的访问则是通过使用这些属性逐个访问成员对象来完成。这种在多个成员对象之间的导航操作导致了客户端和后端数据库系统之间的获取操作大幅度增加,从而导致严重的性能问题。对象预取技术根据某种策略,将应用程序可能访问到的对象成组或批量地预先从数据库中装载到客户端,从而减少了应用程序对后端数据库系统进行查询的次数。本文对现有各种对象预取技术并对其进行分析分类,在此基础上,提出了一种基于多级访问模式的对象预取技术。最后,介绍了该算法在软件构件平台StarC-CM的持久对象框架中的实现。 In the persistent object framework based on RDBMS and O/R mapping, objects connect each other via references and collection attributes, and applications navigate from one to another in these objects. These navigations dramatically increased the fetch operations between client and back-end database server, and brought serious performance problem. Object prefetching techniques load objects that the application maybe access successively from database to client-side cache by group or in batch based on some kind of predication policy. This paper classifies various object prefetching policy, and promots a new kind of prefecthing algorithm based on multi-level access pattern. Furthermore, a prototype implementation of this algorithm in the persistent object framework designed for our software component platform StarCCM.
出处 《计算机科学》 CSCD 北大核心 2007年第6期139-141,共3页 Computer Science
基金 国家自然科学基金项目"新一代网络中间件的体系结构 协议及实现机制"(No.90104020) 国家863课题"网络环境的新一代中间件核心技术及运行平台"(No.2004AA112020)的资助。
关键词 持久对象框架 软件构件平台 多级访问模式 预取 Persistent object framework, Software component platform, Mmulti-level access pattern, Prefetching
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参考文献7

  • 1StarCCM:A CORBA Component Model implementation in C++ language.http://starccm.sourceforge.net,2004
  • 2Bernstein P A,Pal S,Shutt D.Context-Based Prefetch for Implementing Objects on Relations.In:Proc.25th Int'l Conf.Very Large Data Bases,1999.327~338
  • 3Curewitz K M,Krishnan P,Vitter J S.Practical Prefetching via Data Compression.In:Proc.ACM SIGMOD Int'l Conf.Management of Data,1993.257~266
  • 4Kim W,et al.Architecture of the ORION Next-Generation Database System.IEEE Trans.Knowledge and Data Eng,1990,2(1)
  • 5Lamb C,et al.The ObjectStore System.Comm.ACM,1991,34 (1):50~53
  • 6Palmer Z,Zdonik S B.Fido:A Cache That Learns to Fetch.In:Proc.17th Int'l Conf.Very Large Data Bases,1991.255~264
  • 7Han W S,Whang K Y,Moon Y S.A Formal Framework for Prefetching Based on the Type-Level Access Pattern in ObjectRelational DBMSs.IEEE Transactions on Knowledge and Data Engineering,2005,17(10)

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