...rage)使得我们需要花费时间加载每一行,而真正需要的数据可能仅是每行中的几个数据列而已。如果存储结构基于列(Column-based),那么单列查询就只需要加载硬盘中的最小列块,这种方式在磁盘IO上是比较高效的。
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...的原因;其次, 在存储体系结构设计方面我们给出一些建议; 实验主要评价两种存储模型: 行存储(row-based) 和列存储 (column-based)在现代处理器上的不同行为特性. Algorithm 2.
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Virtual Column-Based 基于虚拟列
column-based floating production system 柱形浮动采油系统
silica-based monolithic column 硅基整体柱
force based beam-column element 基于力形函数的梁柱单元
Fiber-model based beam-column element 基于纤维模型的梁柱单元
methacrylate ester-based capillary monolithic column 聚甲基丙烯酸酯毛细管整体柱
Specifies column-based defaults for the table properties.
说明基于列的表格缺省属性。
Based on the sample database, it is now possible to show how to configure and install the Universal Services for a specific pureXML column, which is the subject of following sections.
有了示例数据库,现在可以展示如何配置和安装用于特定purexml列的Universal Services,这正是后面小节的主题。
More database security: a new security feature called Label-Based access control (LBAC) allows you to control data access at the row and column level.
增强了数据库安全性:基于标签的访问控制(Label Based Access Control, LBAC)是一种新的安全特性,它使您可以在行和列的级别上控制数据访问。
this is on page 847 about halfway down the left-hand column: segment of language can never in the final analysis be based on anything except its noncoincidence with the rest.
翻到847页的左下角:,对于语言片段的理解,只能基于它和其他语言的不相似处。
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