Similar event classes are grouped by a category. Each row in the sys.trace_categories catalog view identifies a category that is unique across the server. These categories do not change for a given version of the SQL Server Database Engine.
For a complete list of supported trace events, see SQL Server Event Class Reference.
Unique ID of this category. This column is also in the sys.trace_events catalog view.
Unique name of this category. This parameter is not localized.
0 = Normal
1 = Connection
2 = Error
In SQL Server 2005 and later versions, the visibility of the metadata in catalog views is limited to securables that a user either owns or on which the user has been granted some permission. For more information, see Metadata Visibility Configuration.