- 28 Sep, 2023
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How to Monitor Standby Database
FIND THE ARCHIVE LAG BETWEEN PRIMARY AND STANDBY:
select LOG_ARCHIVED-LOG_APPLIED "LOG_GAP" from (SELECT MAX(SEQUENCE#) LOG_ARCHIVED FROM V$ARCHIVED_LOG WHERE DEST_ID=1 AND ARCHIVED='YES'), (SELECT MAX(SEQUENCE#) LOG_APPLIED FROM V$ARCHIVED_LOG WHERE DEST_ID=2 AND APPLIED='YES');
CHECK THE STATUS OF DIFFERENT PROCESS:
SQL> SELECT PROCESS, STATUS, THREAD#, SEQUENCE#, BLOCK#, BLOCKS FROM V$MANAGED_STANDBY ; PROCESS STATUS THREAD# SEQUENCE# BLOCK# BLOCKS --------- ------------ ---------- ---------- ---------- ---------- ARCH CONNECTED 0 0 0 0 ARCH CONNECTED 0 0 0 0 ARCH CONNECTED 0 0 0 0 ARCH CONNECTED 0 0 0 0 MRP0 WAIT_FOR_LOG 1 53056 0 0 RFS IDLE 0 0 0 0 RFS IDLE 0 0 0 0 RFS IDLE 1 53056 10935 2 RFS IDLE 0 0 0 0 9 rows selected.
LAST SEQUENCE RECEIVED AND LAST SEQUENCE APPLIED:
SQL> SELECT al.thrd "Thread", almax "Last Seq Received", lhmax "Last Seq Applied" FROM 2 (select thread# thrd, MAX(sequence#) almax FROM v$archived_log WHERE resetlogs_change#=(SELECT resetlogs_change# 3 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$database) GROUP BY thread#) lh WHERE al.thrd = lh.thrd; 4 Thread Last Seq Received Last Seq Applied ---------- ----------------- ---------------- 1 49482 49482
CHECK THE MESSAGES/ERRORS IN STNADBY DATABASE:
set pagesize 2000 set lines 2000 col MESSAGE for a90 select message,timestamp from V$DATAGUARD_STATUS where timestamp > sysdate - 1/6; MESSAGE TIMESTAMP ------------------------------------------------------------------------------------------ --------- RFS[48]: No standby redo logfiles created 05-AUG-15 Media Recovery Log /uv1010/arch/MRSX/arch_MRSX_779539386_1_49481.log 05-AUG-15 Media Recovery Waiting for thread 1 sequence 49482 (in transit) 05-AUG-15 RFS[48]: No standby redo logfiles created 05-AUG-15 Media Recovery Log /uv1010/arch/MRSX/arch_MRSX_779539386_1_49482.log 05-AUG-15 Media Recovery Waiting for thread 1 sequence 49483 (in transit) 05-AUG-15 6 rows selected.
CHECK THE NUMBER OF ARCHIVES GETTING GENERATING ON HOURLY BASIS:
SELECT TO_CHAR(TRUNC(FIRST_TIME),'Mon DD') "DG Date", TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME,'HH24'),'00',1,0)),'9999') "12AM", TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME,'HH24'),'01',1,0)),'9999') "01AM", TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME,'HH24'),'02',1,0)),'9999') "02AM", TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME,'HH24'),'03',1,0)),'9999') "03AM", TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME,'HH24'),'04',1,0)),'9999') "04AM", TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME,'HH24'),'05',1,0)),'9999') "05AM", TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME,'HH24'),'06',1,0)),'9999') "06AM", TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME,'HH24'),'07',1,0)),'9999') "07AM", TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME,'HH24'),'08',1,0)),'9999') "08AM", TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME,'HH24'),'09',1,0)),'9999') "09AM", TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME,'HH24'),'10',1,0)),'9999') "10AM", TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME,'HH24'),'11',1,0)),'9999') "11AM", TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME,'HH24'),'12',1,0)),'9999') "12PM", TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME,'HH24'),'13',1,0)),'9999') "1PM", TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME,'HH24'),'14',1,0)),'9999') "2PM", TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME,'HH24'),'15',1,0)),'9999') "3PM", TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME,'HH24'),'16',1,0)),'9999') "4PM", TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME,'HH24'),'17',1,0)),'9999') "5PM", TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME,'HH24'),'18',1,0)),'9999') "6PM", TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME,'HH24'),'19',1,0)),'9999') "7PM", TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME,'HH24'),'20',1,0)),'9999') "8PM", TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME,'HH24'),'21',1,0)),'9999') "9PM", TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME,'HH24'),'22',1,0)),'9999') "10PM", TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME,'HH24'),'23',1,0)),'9999') "11PM" FROM V$LOG_HISTORY GROUP BY TRUNC(FIRST_TIME) ORDER BY TRUNC(FIRST_TIME) DESC /
Find LAG in dataguard with ORACLE RAC :
set echo on feed on term on set linesize 120 col PRIMARY_TIME format a20 col STANDBY_COMPLETION_TIME format a23 spool dg_lag_minutes_&1..sql.log.txt SELECT prim.thread# thread, prim.seq primary_seq, to_char(prim.tm, ‘DD-MON-YYYY HH24:MI:SS’) primary_time, tgt.thread# standby_thread, tgt.seq standby_seq, to_char(tgt.tm, ‘DD-MON-YYYY HH24:MI:SS’) standby_completion_time, prim.seq – tgt.seq seq_gap, ( prim.tm – tgt.tm ) * 24 * 60 lag_minutes FROM ( SELECT thread#, MAX(sequence#) seq, MAX(completion_time) tm FROM v$archived_log GROUP BY thread# ) prim, ( SELECT thread#, MAX(sequence#) seq, MAX(completion_time) tm FROM v$archived_log WHERE dest_id IN ( SELECT dest_id FROM v$archive_dest WHERE target = ‘STANDBY’ ) AND applied = ‘YES’ GROUP BY thread# ) tgt WHERE prim.thread# = tgt.thread#; spool off