DATAGUARD MONITORING

DATAGUARD MONITORING
====================

Check DB role(PRIMARY/STANDBY):
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SELECT DATABASE_ROLE, DB_UNIQUE_NAME INSTANCE, OPEN_MODE, PROTECTION_MODE, PROTECTION_LEVEL, SWITCHOVER_STATUS FROM V$DATABASE;


Monitor standby background process:
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SELECT PROCESS, STATUS, THREAD#, SEQUENCE#, BLOCK#, BLOCKS FROM V$MANAGED_STANDBY ;


View dataguard message or errors:
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SELECT MESSAGE FROM V$DATAGUARD_STATUS;

Last log applied/Received in standby
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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);



Get standby redo log info:
==========================

set lines 100 pages 999
col member format a70
selectst.group#
,st.sequence#
,ceil(st.bytes / 1048576) mb
,lf.member
fromv$standby_logst
,v$logfilelf
wherest.group# = lf.group#
/





Monitor recovery progress in standby db:
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select to_char(START_TIME,'DD-MON-YYYY HH24:MI:SS') "Recovery Start Time",to_char(item)||' = '||to_char(sofar)||''||to_char(units) "Progress"
from v$recovery_progress where start_time=(select max(start_time) from v$recovery_progress);



Stop/start MRP process in standby:
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alter database recover managed standby database cancel;

alter database recover managed standby database disconnect from session;

alter database recover managed standby database using current logfile disconnect from session;