Dynamic management views can be referenced in Transact-SQL statements by using two-part, three-part, or four-part names. Dynamic management functions on the other hand can be referenced in Transact-SQL statements by using either two-part or three-part names. Dynamic management views and functions cannot be referenced in Transact-SQL statements by using one-part names.

All dynamic management views and functions exist in the sys schema and follow this naming convention dm_*. When you use a dynamic management view or function, you must prefix the name of the view or function by using the sys schema. For example, to query the dm_os_wait_stats dynamic management view, run the following query:

SELECT wait_type, wait_time_ms

FROM sys.dm_os_wait_stats;

GO

Required Permissions

To query a dynamic management view or function requires SELECT permission on object and VIEW SERVER STATE or VIEW DATABASE STATE permission. This lets you selectively restrict access of a user or login to dynamic management views and functions. To do this, first create the user in master and then deny the user SELECT permission on the dynamic management views or functions that you do not want them to access. After this, the user cannot select from these dynamic management views or functions, regardless of database context of the user.

Note:
Because DENY takes precedence, if a user has been granted VIEW SERVER STATE permissions but denied VIEW DATABASE STATE permission, the user can see server-level information, but not database-level information.

Dynamic management views and functions have been organized into the following categories.

Reference

Help and Information