Check the last applied and shipped archive log in Oracle Dataguard

Check the archive log status in Oracle Data guard

Check the received and applied archive log on the Oracle Dataguard environment

select 'Last Log applied : ' Logs, to_char(next_time,'DD-MON-YY:HH24:MI:SS') Time from v$archived_log where sequence# = (select max(sequence#) from v$archived_log where applied='YES')
union
select 'Last Log received : ' Logs, to_char(next_time,'DD-MON-YY:HH24:MI:SS')
Time from v$archived_log where sequence# = (select max(sequence#) from v$archived_log);

Find the last applied log on Standby Server:

select to_char(max(FIRST_TIME),'hh24:mi:ss dd/mm/yyyy') FROM
V$ARCHIVED_LOG where applied='YES';

Find out the last seq received and applied in Dataguard

SELECT al.thrd "Thread", almax "Last Seq Received", lhmax "Last Seq Applied" FROM (select thread# thrd, MAX(sequence#) almax FROM v$archived_log WHERE resetlogs_change#=(SELECT resetlogs_change# FROM v$database) GROUP BY thread#) al, (SELECT thread# thrd, MAX(sequence#) lhmax FROM v$log_history WHERE resetlogs_change#=(SELECT resetlogs_change# FROM v$database) GROUP BY thread#) lh WHERE al.thrd = lh.thrd;