XML is not only an intermedis between the WEB and DBMS.W3C has defined many database characters for XML,such as schema,algebra,etc,so we believe that XML will become a new data model of database,and it is necessary to...XML is not only an intermedis between the WEB and DBMS.W3C has defined many database characters for XML,such as schema,algebra,etc,so we believe that XML will become a new data model of database,and it is necessary to apply traditional DBMS techniques to build a XML DBMS.In this paper we show the necessity of building a XML DBMS and present the rachitecture of it,based on natural XML data model.Them we describe some key techniques of XML DBMS,including data storage,query optimization and visual user interface.展开更多
集中研究了非结构化的数据存储和查询。为了在保证查询成功率的同时最小化总的能耗,分别在存储受限和不受限两种情况下,建立了MESQ(minimizing energy on success fulquery)优化问题模型,给出并证明了最优的复本和查询个数。在此基础上...集中研究了非结构化的数据存储和查询。为了在保证查询成功率的同时最小化总的能耗,分别在存储受限和不受限两种情况下,建立了MESQ(minimizing energy on success fulquery)优化问题模型,给出并证明了最优的复本和查询个数。在此基础上,还设计了一个实用的分布式数据分发算法:BubbleGeocast,其主要包含精确自适应快速分发和基于拒绝的均匀分发两个部分,其中前者用自适应分支的方法加速数据扩散,并精确控制总的复本个数;后者根据每个节点Voronoi单元面积,决定是否接受或拒绝这个报文。从而保证了复本和查询分发的精确性、实时性、均匀性、顽健性。最后,详细的理论分析和模拟实验进一步验证了其性能。分析和实验表明,同已有工作相比,在相同查询成功率时,BubbleGeocast能量有效性平均提高了约30%,复本分发的延迟平均缩短了约30%,成功查询的延迟平均缩短了约50%。展开更多
文摘XML is not only an intermedis between the WEB and DBMS.W3C has defined many database characters for XML,such as schema,algebra,etc,so we believe that XML will become a new data model of database,and it is necessary to apply traditional DBMS techniques to build a XML DBMS.In this paper we show the necessity of building a XML DBMS and present the rachitecture of it,based on natural XML data model.Them we describe some key techniques of XML DBMS,including data storage,query optimization and visual user interface.
文摘集中研究了非结构化的数据存储和查询。为了在保证查询成功率的同时最小化总的能耗,分别在存储受限和不受限两种情况下,建立了MESQ(minimizing energy on success fulquery)优化问题模型,给出并证明了最优的复本和查询个数。在此基础上,还设计了一个实用的分布式数据分发算法:BubbleGeocast,其主要包含精确自适应快速分发和基于拒绝的均匀分发两个部分,其中前者用自适应分支的方法加速数据扩散,并精确控制总的复本个数;后者根据每个节点Voronoi单元面积,决定是否接受或拒绝这个报文。从而保证了复本和查询分发的精确性、实时性、均匀性、顽健性。最后,详细的理论分析和模拟实验进一步验证了其性能。分析和实验表明,同已有工作相比,在相同查询成功率时,BubbleGeocast能量有效性平均提高了约30%,复本分发的延迟平均缩短了约30%,成功查询的延迟平均缩短了约50%。
