Sqlserver查询alwayson同步情况脚本（1）
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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