Archive log switch history

Track archive log switching by the day and by the hour.

Here is a script to track archive log switching by the day and by the hour. Since most of the work on our databases take place between the 1st and 7th of the month, the script is limited by that. It shows you the number of switches by the hour and by the day. It's very informative when deciding on log sizes and the number of logs.

--Shows archive log history
--ARCHIVE LOGS SWITCHES BROKEN DOWN BY THE HOUR SINCE THE FIRST OF THE MONTH
set pages 500
set lines 132
set pause off
column TIMESTAMP format a17

break on DAY
COMPUTE SUM OF SWITCHES ON DAY
break on day

SELECT 
TO_CHAR(TRUNC(H.first_time),'DD-MON-YYYY') "DAY"
,TO_CHAR(H.FIRST_TIME,'HH24')||':00' "HOUR"
,count(*) "SWITCHES"
,TO_CHAR(AVG(A.blocks*a.block_size),'999,999,999,999') "AVGBYTES"
FROM
V$LOGHIST H
,V$ARCHIVED_LOG A
WHERE
H.SEQUENCE#=A.SEQUENCE#
--AND H.FIRST_TIME > SYSDATE - 10
AND H.FIRST_TIME > LAST_DAY(ADD_MONTHS(TRUNC(SYSDATE),-1))+1
GROUP BY 
TRUNC(H.first_time)
,TO_CHAR(H.FIRST_TIME,'HH24')
ORDER BY 
TRUNC(H.first_time) DESC
,TO_NUMBER(TO_CHAR(H.FIRST_TIME,'HH24'))
/

Reader Feedback

Jeff W. writes: This tip looks worthwhile. Unfortunately, it does not run on our version of Oracle (7.3.4).

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This was first published in July 2002

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