Suffice it to say that anyone wanting to create a database system must be familiar with the concept of normalization.

任何想要创建数据库系统的人们必需熟悉标准化的概念,只要说明这个就够了。

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To overcome this restriction and to maximize the flexibility of a relational database system, DB2 V9.5 introduces the concept of global variables.

为克服这种约束并最大化实现关系数据库系统的灵活性，DB2 V9.5 引入了全局变量的概念。

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SQLite has no concept of user accounts, and instead relies on the file system for all database permissions.

SQLite没有用户帐户概念，而是根据文件系统确定所有数据库的权限。

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In his most straightforward comment to date on the power that comes from optimizing hardware and software from the ground up, Ballmer sounds a lot like Oracle CEO Larry Ellison, who launched the the engineered-system concept about four years ago with the first version of the Oracle Exadata Database Machine.

FORBES: Steve Ballmer Joins Larry Ellison as Software-Hardware Evangelist