When using Allways On with asyncron secondary server, the secondary server sometimes fall behind if lots of changes on primary server. But how far behind? I am using this command to get a picture of the status. The command is executed on primary server. select recovery_lsn,truncation_lsn,last_hardened_lsn,last_received_lsn,last_redone_lsn,last_redone_timefrom sys.dm_hadr_database_replica_states