RE: RE: dbms_job - running jobs every 15 minutes

From: Stephane Faroult <sfaroult_at_oriolecorp.com>
Date: Wed, 22 Jan 2003 00:44:38 -0800
Message-ID: <F001.005370C9.20030122004438@fatcity.com>

('binary' encoding is not supported, stored as-is)
>
>How about
>
>dbms_job.submit(:jobno, 'statspack.snap',
>sysdate+n/1440, 'sysdate
>15/1440');
>
>where n= a number of minutes to the nearest 15
>minutes. So if it's 14:25
>then it would
>be sysdate+5/1440.
>
>since you only need to do this one time, just make
>sure that sysdate + n =
>0, 15, 30 or 45
>after the hour... :-) Of course, if you want to
>automate the thing, then
>build this around a PL/SQL procedure...that
>calculates the value of n.....
>Not elegant, but I think that when
>someone looks at DBA_JOBS they are not going to ask
>what the $*#(@( you were
>trying to do..
>I subscribe to the KISS philosophy...
>
>:-)
>
>RF
>
>
>-----Original Message-----
>Jared.Still_at_radisys.com
>Sent: Tuesday, January 21, 2003 6:24 PM
>To: Multiple recipients of list ORACLE-L
>
>
>Feeling particularly anal the other day, I used
>the following
>specification to
>run statspack at the top of the hour, 15, 30 and 45
>minutes after the
>hour.
>
>variable jobno number;
>variable instno number;
>begin
> select instance_number into :instno from
>v$instance;
> dbms_job.submit(
> :jobno
> , 'statspack.snap;'
> -- every 15 minutes at 00,15,30 and
>45
> , trunc(sysdate,'hh24') + ( ( 15 +
>( 15 *
>floor(to_number(to_char(sysdate,'mi')) / 15))) / (
>24 * 60 ))
> , 'trunc(sysdate,''hh24'') + ( (
>15 + ( 15 *
>floor(to_number(to_char(sysdate,''mi'')) / 15))) /
>( 24 * 60 ))'
> );
> commit;
>end;
>/
>
>
>Seems to me that the time specs could be simplified
>a bit.
>
>Anyone care to give it a go? :)
>
>Jared
>
>--
>Please see the official ORACLE-L FAQ:
>http://www.orafaq.net

Robert,

   I am afraid that you will soon run into the 'slipping job' syndrom. Without any 'trunc' (or anything functionally similar), 'sysdate' in the interval happens to be the date when the job started - which may be up to one minute (usually) the time when you asked it to start. Means that you can easily slip by four minutes every hour. I agree with adding 15/1440 (one day = 1440mn), but your base time musn't be 'sysdate' but sysdate rounded to the nearest quarter of an hour. Considering that a quarter of an hour is a 96th (24 * 4) of a day you have several more or less complicated ways to do it. Vladimir (whose formula I am still trying to understand :-)) took the seconds since midnight, you can also do something such as  [today 00:00] trunc(sysdate)
 + [current time rounded to the latest quarter of an hour] floor((sysdate - trunc(sysdate))* 96) / 96  + 15/1440

HTH, Stephane Faroult
Oriole

-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.net
-- 
Author: Stephane Faroul
  INET: sfaroult_at_oriolecorp.com

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Received on Wed Jan 22 2003 - 02:44:38 CST