Check primary and standby databases are in sync Dataguard

Check physical Standby is in sync Dataguard

The following command will help to check the Standby is synced with Primary Database in Oracle Dataguard Environment.

On Primary Server:

Check the current log sequence on the Primary database:

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;

OR 

Archive log list;

On Physical Standby Server:

Check the received log on the standby database

--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 the applied log on the Standby database:

--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;


On Standby: Even we can check with the archive gap:

col thread# for a20
col low_sequence# for a20
col high_sequence# for a20
select * from v$archive_gap;

Get the list of archived applied:

select sequence#, first_time, next_time, applied from v$archived_log where applied='YES' order by sequence#;