Determine Active Node in SQL Failover Cluster

Question

Does anyone know how to determine the active node of a SQL Active-Passive Failover Cluster programmatically from T-SQL?

@@SERVERNAME only returns the virtual server name, which is identical from both nodes.

I don't plan to make any decisions based on the data - I trust the failover to do its thing - but I would like to include the information in an event log so I can tell which node in the cluster was active when the event occurred, or help determine if exceptions come up as a result of a failover.

Answer 1

Select ServerProperty('ComputerNamePhysicalNetBIOS')

Answer 2

This works in newer versions:

SELECT * FROM fn_virtualservernodes();

full details at https://docs.microsoft.com/en-us/sql/relational-databases/system-functions/sys-fn-virtualservernodes-transact-sql?view=sql-server-2017

SELECT * FROM sys.dm_os_cluster_nodes; 

full details at https://docs.microsoft.com/en-us/sql/relational-databases/system-dynamic-management-views/sys-dm-os-cluster-nodes-transact-sql?view=sql-server-2017

Answer 3

Try this, this checks if Server is the Primary server in the Availability Group and then based on this condition do X:

IF EXISTS (SELECT ars.role FROM sys.dm_hadr_availability_replica_states ars JOIN sys.availability_groups ag ON ars.group_id = ag.group_id WHERE ars.role_desc = 'PRIMARY')
    BEGIN
        SELECT 'PRIMARY' -- DO STUFF IF PRIMARY
    END
ELSE
    BEGIN
        SELECT 'NOT PRIMARY' --- DON'T DO STUFF
    END