题目详情

在分布式数据库中有分片透明、复制透明、位置透明和逻辑透明等基本概念,其中:(请作答此空)是指局部数据模型透明,即用户或应用程序无须知道局部使用的是哪种数据模型;( )是指用户或应用程序不需要知道逻辑上访问的表具体是怎么分块存储的。

  • A.分片透明
  • B.复制透明
  • C.位置透明
  • D.逻辑透明

正确答案及解析

正确答案
D
解析

本题考查对分布式数据库基本概念的理解。分片透明是指用户或应用程序不需要知道逻辑上访问的表具体是怎么分块存储的。复制透明是指采用复制技术的分布方法,用户不需要知道数据是复制到哪些节点,如何复制的。位置透明是指用户无须知道数据存放的物理位置。逻辑透明,即局部数据模型透明,是指用户或应用程序无须知道局部场地使用的是哪种数据模型

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