sys.dm_hadr_instance_node_map (Transact-SQL)

APPLIES TO: YesSQL Server NoAzure SQL Database NoAzure Synapse Analytics (SQL DW) NoParallel Data Warehouse

For every instance of SQL Server that hosts an availability replica that is joined to its Always On availability group, returns the name of the Windows Server Failover Cluster (WSFC) node that hosts the server instance. This dynamic management view has the following uses:

  • This dynamic management view is useful for detecting an availability group with multiple availability replicas that are hosted on the same WSFC node, which is an unsupported configuration that could occur after an FCI failover if the availability group is incorrectly configured. For more information, see Failover Clustering and Always On Availability Groups (SQL Server).

  • When multiple SQL Server instances are hosted on the same WSFC node, the Resource DLL uses this dynamic management view to determine the instance of SQL Server to connect to.

Column name Data type Description
ag_resource_id nvarchar(256) Unique ID of the availability group as a resource in the WSFC.
instance_name nvarchar(256) Name-server/instance-of a server instance that hosts a replica for the availability group.
node_name nvarchar(256) Name of the WSFC node.


Requires VIEW SERVER 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)