sys.dm_hadr_name_id_map (Transact-SQL)
Applies to: 
SQL Server
Shows the mapping of Always On availability groups that the current instance of SQL Server has joined to three unique IDs: an availability group ID, a WSFC resource ID, and a WSFC Group ID. The purpose of this mapping is to handle the scenario in which the WSFC resource/group is renamed.
| Column name | Data type | Description |
|---|---|---|
| ag_name | nvarchar(256) | Name of the availability group. This is a user-specified name that must be unique within the Windows Server Failover Cluster (WSFC) cluster. |
| ag_id | uniqueidentifier | Unique identifier (GUID) of the availability group. |
| ag_resource_id | nvarchar(256) | Unique ID of the availability group as a resource in the WSFC cluster. |
| ag_group_id | nvarchar(256) | Unique WSFC Group ID of the availability group. |
Permissions
Requires VIEW SERVER STATE permission on the server.
Permissions for SQL Server 2022 and later
Requires VIEW SERVER PERFORMANCE STATE permission on the server.
See also
Always On Availability Groups Dynamic Management Views and Functions (Transact-SQL)
Always On Availability Groups Catalog Views (Transact-SQL)
Monitor Availability Groups (Transact-SQL)
Always On Availability Groups (SQL Server)