RE: LGWR switching statistic

From: John Hallas <John.Hallas_at_morrisonsplc.co.uk>
Date: Mon, 29 Sep 2014 07:49:11 +0100
Message-ID: <EC65ECF8123FEE4D8FC5B212637C304001667C8B6753_at_EXCH1.morrisonsplc.co.uk>

I have had this since 8i - produces a nice display

rem
rem success determined by maxloghistory setting rem
set pages 34
set lines 240

select to_date(substr(first_time,1,9),'dd-mm-yy') day,
       to_char(sum(decode(substr(to_char(first_time,'DD/MM/YY HH24-MI-SS'),10,2),'00',1,0)),'999') "00",
       to_char(sum(decode(substr(to_char(first_time,'DD/MM/YY HH24-MI-SS'),10,2),'01',1,0)),'999') "01",
       to_char(sum(decode(substr(to_char(first_time,'DD/MM/YY HH24-MI-SS'),10,2),'02',1,0)),'999') "02",
       to_char(sum(decode(substr(to_char(first_time,'DD/MM/YY HH24-MI-SS'),10,2),'03',1,0)),'999') "03",
       to_char(sum(decode(substr(to_char(first_time,'DD/MM/YY HH24-MI-SS'),10,2),'04',1,0)),'999') "04",
       to_char(sum(decode(substr(to_char(first_time,'DD/MM/YY HH24-MI-SS'),10,2),'05',1,0)),'999') "05",
       to_char(sum(decode(substr(to_char(first_time,'DD/MM/YY HH24-MI-SS'),10,2),'06',1,0)),'999') "06",
       to_char(sum(decode(substr(to_char(first_time,'DD/MM/YY HH24-MI-SS'),10,2),'07',1,0)),'999') "07",
       to_char(sum(decode(substr(to_char(first_time,'DD/MM/YY HH24-MI-SS'),10,2),'08',1,0)),'999') "08",
       to_char(sum(decode(substr(to_char(first_time,'DD/MM/YY HH24-MI-SS'),10,2),'09',1,0)),'999') "09",
       to_char(sum(decode(substr(to_char(first_time,'DD/MM/YY HH24-MI-SS'),10,2),'10',1,0)),'999') "10",
       to_char(sum(decode(substr(to_char(first_time,'DD/MM/YY HH24-MI-SS'),10,2),'11',1,0)),'999') "11",
       to_char(sum(decode(substr(to_char(first_time,'DD/MM/YY HH24-MI-SS'),10,2),'12',1,0)),'999') "12",
       to_char(sum(decode(substr(to_char(first_time,'DD/MM/YY HH24-MI-SS'),10,2),'13',1,0)),'999') "13",
       to_char(sum(decode(substr(to_char(first_time,'DD/MM/YY HH24-MI-SS'),10,2),'14',1,0)),'999') "14",
       to_char(sum(decode(substr(to_char(first_time,'DD/MM/YY HH24-MI-SS'),10,2),'15',1,0)),'999') "15",
       to_char(sum(decode(substr(to_char(first_time,'DD/MM/YY HH24-MI-SS'),10,2),'16',1,0)),'999') "16",
       to_char(sum(decode(substr(to_char(first_time,'DD/MM/YY HH24-MI-SS'),10,2),'17',1,0)),'999') "17",
       to_char(sum(decode(substr(to_char(first_time,'DD/MM/YY HH24-MI-SS'),10,2),'18',1,0)),'999') "18",
       to_char(sum(decode(substr(to_char(first_time,'DD/MM/YY HH24-MI-SS'),10,2),'19',1,0)),'999') "19",
       to_char(sum(decode(substr(to_char(first_time,'DD/MM/YY HH24-MI-SS'),10,2),'20',1,0)),'999') "20",
       to_char(sum(decode(substr(to_char(first_time,'DD/MM/YY HH24-MI-SS'),10,2),'21',1,0)),'999') "21",
       to_char(sum(decode(substr(to_char(first_time,'DD/MM/YY HH24-MI-SS'),10,2),'22',1,0)),'999') "22",
       to_char(sum(decode(substr(to_char(first_time,'DD/MM/YY HH24-MI-SS'),10,2),'23',1,0)),'999') "23"
       from   sys.v_$log_history where trunc(first_time) > sysdate -31

group by to_date(substr(first_time,1,9),'dd-mm-yy') order by to_date(substr(first_time,1,9),'dd-mm-yy') /

From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of David Fitzjarrell Sent: 25 September 2014 22:14
To: Amir.Hameed_at_xerox.com; oracle-l_at_freelists.org Subject: Re: LGWR switching statistic

Not in 11.2; since I haven't a 12c database to check I can't say if that's been added. It's a simple query to write, really:

select trunc(first_time,'DD') day, count(sequence#) FROM sys.V_$LOG_HISTORY
WHERE TRUNC(first_time) >= TRUNC(SYSDATE)-&num_days+1 GROUP BY TRUNC(first_time,'DD')
order by 1;

Gives you counts, by day. You can modify that to give hourly counts if you want them.

David Fitzjarrell

Principal author, "Oracle Exadata Survival Guide"

On Thursday, September 25, 2014 2:25 PM, "Hameed, Amir" <Amir.Hameed_at_xerox.com<mailto:Amir.Hameed_at_xerox.com>> wrote:

Hi,
Is there a database statistic available that can tell how many times LGWR switched redo log files?

Thanks,
Amir

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Received on Mon Sep 29 2014 - 08:49:11 CEST