What an interesting question.
Alright, DBMS_JOB needs a function which returns the date/time
on which the job will next run. Part of your function is to
take consider the next 31 days (in case the current run of the
job is somewhere random in the month and not on the first
Wednesday of the current month) and identify the very next
Wednesday, that happens to occur in the first 7 days of the
month.
With that in mind:
select run_date
from (select to_char(sysdate + rownum, 'dd-Mon-yyyy') run_date,
to_char(sysdate + rownum, 'w') week_of_month,
to_char(sysdate + rownum, 'd') day_of_week
from all_objects
where rownum <= 31)
where week_of_month = 1 and
day_of_week = 4;
The inline makes use of a table/view that more or less is
assumed to contain at least 31 objects in order to generate
an offset to represent each day for the next month or so,
which is added to the current sysdate. The inline view
returns the date, week of month, and day of week for the
upcoming 31 days (but necessarily excludes today if today
happens to be the first Wed of this month, otherwise your
job will always identify today as being the next scheduled
run time, and never manage to find next month's first
Wed).
The enclosing query then takes all the date information for
the upcoming week, and limits it to the single record that
occurs within the first week of the month, and is also the
fourth day of the week (which is Wed.)
You may need to trunc() the run_date and do some other
arithmatic to nail down a specific time of day for that
job to run.
Go have fun.
...Rudy
-----Original Message-----
Sent: Tuesday, July 22, 2003 3:14 PM
To: Multiple recipients of list ORACLE-L
Greetings,
How can I set the interval in my dbms job to have it run on the first
Wednesday of every month? Is this even possible? I have been trying to
noodle it thru for a week to no avail.
tia,
Josh
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Author: Josh Collier
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