Note that if the physical file is keyed (perhaps because it has a Primary key constraint), its index will also be moved on or off of SSD with these commands.

注意，如果物理文件使用了键控(可能因为它有一个Primary Key约束)，其隐式索引也将通过这些命令被移动到SSD或从中移出。

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This paper introduces the design & implementation of a parallel file system based on direct data access, and gives out the primary functions and key technologies of parallel file system.

该文介绍了一种基于直接数据访问的并行文件系统的设计和实现，阐明了该并行文件系统具备的主要功能及解决的关键技术问题。

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The retrieval of a data record in an indexed file by the primary (or optionally, alternate) key within the data record .

在索引文件中，通过数据记录中的主要关键字或可选关键字进行数据记录的检索的一种方法。

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