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set dba job to run every 4 hours

Posted on 2012-04-11
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Last Modified: 2012-05-01
I want a job to run every 4 hours not every 4 hours after the previous run completed.

I am not sure what the SYSDATE should be.


SYSDATE+240/1440  this isn't what I want.
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Question by:mw-hosting
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Expert Comment

by:slightwv (䄆 Netminder)
ID: 37834515
>>this isn't what I want.

That is 4 hours from now.  If that is the interval for the job, it will run every 4 hours.

What about this isn't what you want?
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by:sdstuber
sdstuber earned 2000 total points
ID: 37834523
assuming you mean 00:00:00,  04:00:00,  08:00:00, 12:00:00,16:00:00, 20:00:00

try this...


trunc(sysdate)+(mod(to_char(sysdate,'hh'),6)+1)*4/24
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Assisted Solution

by:sdstuber
sdstuber earned 2000 total points
ID: 37834555
also, you might want to look into using dbms_scheduler instead of dbms_job

BEGIN
    DBMS_SCHEDULER.create_job(
        job_name         => 'YOUR_EVERY_4_HOUR_JOB_NAME',
        job_type         => 'PLSQL_BLOCK',
        job_action       => 'begin null; end; ',  --- put your code here
        start_date       => TRUNC(SYSDATE)+1,  -- start tomorrow or whenever you want
        repeat_interval  => 'FREQ=daily;BYHOUR=0,4,8,12,16,20;BYMINUTE=0;BYSECOND=0',
        enabled          => TRUE,
        comments         => 'This ought to do it');
END;
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LVL 23

Expert Comment

by:David
ID: 37834850
Nice example, Sean.
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Accepted Solution

by:
mw-hosting earned 0 total points
ID: 37898716
I applied this:

'TRUNC(SYSDATE+4/24,''HH'')'

I don't have the option to use dbms_scheduler, thanks though.
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Expert Comment

by:sdstuber
ID: 37898986
37898716 --- this allows for drift if your process takes more than an hour to run.
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Author Closing Comment

by:mw-hosting
ID: 37913874
Another option that allows every 4 hours, not depended on the hour provided.
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