- （系统目录）：保存关于数据库地结构、用户、应用程序等信息地数据。
- 系统目录
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system catalog中文什么意思
例句与用法
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- By internal statistics , i mean the statistics in the system catalogs that the optimizer uses to determine the lowest - cost query execution plan
通过内部统计数据，我指的是系统目录中的统计数据，优化器可以确定最低成本的查询执行计划。 - The core of the sql server 2005 system catalogs is a set of views that show metadata that describes the objects in an instance of sql server
Sql server 2005系统目录的核心是一个视图集，这些视图显示了描述sql server实例中的对象的元数据。 - Although these stored procedures and functions are specific to sql server , they insulate users from the structure of the underlying system catalog tables
虽然这些存储过程和函数为sql server所特有，但它们使用户与基础系统目录表的结构隔离开了。 - To find out all accounts with privileges , you can query each of the system catalog views and combine the results together using the union operator , as shown in
要查明具有特权的所有帐号，可以查询每个系统编目视图并使用union操作符将结果组合在一起，如 - Update statistics high against the database . this command updates the statistics in the system catalogs that the optimizer uses to determine the lowest - cost query plan
此命令更新了系统目录中的统计数据，优化程序使用这些数据来确定成本最低的查询计划。