Data guard monitoring

Question

Hi All,
I wanted to know whether difference between output of below queries would give me log gap between primary and standby database on which the dataguard is configured.
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';
I am trying to write a linux script to monitor the data guard.. Please suggest..
Thanks

Answer 1

What I would do is create an SQL file and call it from a Linux script. Here's a start :
SPOOL /tmp/quickcheck.lst
PROMPT
PROMPT Checking Size and usage in GB of Flash Recovery Area
PROMPT
SELECT
  ROUND((A.SPACE_LIMIT / 1024 / 1024 / 1024), 2) AS FLASH_IN_GB,
  ROUND((A.SPACE_USED / 1024 / 1024 / 1024), 2) AS FLASH_USED_IN_GB,
  ROUND((A.SPACE_RECLAIMABLE / 1024 / 1024 / 1024), 2) AS FLASH_RECLAIMABLE_GB,
  SUM(B.PERCENT_SPACE_USED)  AS PERCENT_OF_SPACE_USED
FROM
  V$RECOVERY_FILE_DEST A,
  V$FLASH_RECOVERY_AREA_USAGE B
GROUP BY
  SPACE_LIMIT,
  SPACE_USED ,
  SPACE_RECLAIMABLE ;
PROMPT
PROMPT Checking free space In Flash Recovery Area
PROMPT
column FILE_TYPE format a20
select * from v$flash_recovery_area_usage;
PROMPT
PROMPT Checking last sequence in v$archived_log
PROMPT
clear screen
set linesize 100
column STANDBY format a20
column applied format a10
SELECT  name as STANDBY, SEQUENCE#, applied, completion_time from v$archived_log WHERE  DEST_ID = 2 AND NEXT_TIME > SYSDATE -1;
prompt
prompt Checking Last log on Primary
prompt
select max(sequence#) from v$archived_log where NEXT_TIME > sysdate -1;
SPOOL OFFRun on your primary
If you find this helpful please mark it so.
Best Regards
mseberg