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This article mainly describes how Sqlserver queries alwayson synchronization, the article is very detailed, has a certain reference value, interested friends must read it!

SELECT availability_mode_desc ,

role_desc ,

replica_server_name ,

last_redone_time ,

GETDATE() now ,

DATEDIFF(ms, last_redone_time, GETDATE()) diffMS

FROM ( ( sys.availability_groups AS ag

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

)

JOIN sys.dm_hadr_availability_replica_states AS ar_state ON ar.replica_id = ar_state.replica_id

)

JOIN sys.dm_hadr_database_replica_states dr_state ON ag.group_id = dr_state.group_id

AND dr_state.replica_id = ar_state.replica_id;

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