Check primary and standby databases are in sync Dataguard in Oracle Database 19c

The Oracle Dataguard Environment's Standby and Primary Databases may be verified by using the following command.

On Primary Server:

alter system archive log current;

select thread#, max(sequence#) "Last Primary Seq Generated" from v$archived_log val, v$database vdb where val.resetlogs_change# = vdb.resetlogs_change# group by thread# order by 1;

On Physical Standby Server:

--Check received log on standby

select thread#, max(sequence#) "Last Standby Seq Received" from v$archived_log val, v$database vdb where val.resetlogs_change# = vdb.resetlogs_change# group by thread# order by 1;

--Check applied log on standby

select thread#, max(sequence#) "Last Standby Seq Applied" from v$archived_log val, v$database vdb where val.resetlogs_change# = vdb.resetlogs_change# and val.applied in ('YES','IN-MEMORY') group by thread# order by 1;