Gather Always On Configuration using a DMV query

If you were like me, you would know your AG configuration by heart. However, what if you get busy with increasing responsibilities in other areas, projects etc.? Therefore, you do not just want to rely on your memory. On the other hand, maybe you want to simply collect snapshot of your configuration every now and then or have it documented before a major upgrades, for your junior DBAs, new hire etc...

Alternatively, maybe you just started working for a new employer or a new client. 

Whatever is your reason, here is a DMV query to gather the information.

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SELECT  ag.name ag_name ,

        ar.replica_server_name replica_server ,

        CASE WHEN hdrs.is_primary_replica = 0

                  AND hdrs.replica_id = ar.replica_id THEN 0

             ELSE 1

        END is_primary ,

        adc.database_name ,

        agl.dns_name ,

        agl.port ,

        *

FROM    sys.availability_groups ag

        INNER JOIN sys.availability_replicas ar ON ag.group_id = ar.group_id

        INNER JOIN sys.availability_databases_cluster adc ON adc.group_id = ag.group_id

        INNER JOIN sys.availability_group_listeners agl ON agl.group_id = ag.group_id

        LEFT  JOIN sys.dm_hadr_database_replica_states hdrs ON hdrs.group_id = adc.group_id

                                                              AND hdrs.group_database_id = adc.group_database_id

                                                              AND hdrs.replica_id = ar.replica_id

ORDER BY ag.name , adc.database_name , is_primary DESC;