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Oracle dbms_job example

Oracle Tips by Burleson Consulting
Don Burleson

For more working details and a complete code depot, see the wonderful $16.95 book Oracle Job Scheduling by Dr. Timothy Hall.  You can get the best deal (30%-off by) buying it directly from the publisher.

Also, For Oracle10g see Oracle dbms_scheduler examples.


 

The DATE datatype is used by Oracle to store all datetime information in which a precision greater than one second is not needed.  Oracle uses a seven byte binary date format which allows Julian dates to be stored within the range of 01-Jan-4712 BC to 31-Dec-4712 AD.  Table 3.1 shows how each of the seven bytes is used to store the date information:

BYTE

MEANING

NOTATION

EXAMPLE

(10-JUL-2004 17:21:30)

1

Century

Divided by 100, excess-100

120

2

Year

Modulo 100, excess-100

104

3

Month

0 base

7

4

Day

0 base

10

5

Hour

excess-1

18

6

Minute

excess-1

22

7

Second

excess-1

31

Table 3.1 - How each of the seven bytes is used to store the date information

 


As a review, the dbms_job.submit procedure accepts three parameters, the name of the job to submit, the start time for the job, and the interval to execute the job:

dbms_job.submit(
   what=>'statspack_alert.sql;',

   next_date=>sysdate+1/24, -- start next hour
   interval=>'sysdate+1/24');  -- Run every hour

The problem with this procedure is that while we specify the initial start time and re-execution interval, we do not see a mechanism for running the job during predetermined hours during the day.  For example, how do we start a job at 8:00 AM, run it hourly, and then stop at 5:00 PM?

The example about will schedule the job to run hourly, but to get time intervals, it is necessary to create two other jobs, one to “break” the job at 5:00 PM and another to un-break the job the following morning at 8:0 AM.

For advanced scheduling purposes we can create customized intervals such that start and stop at specified intervals.  Here are some working Oracle dbms_job scheduling frequency examples:

The following examples show how to use these procedures to schedule the my_job_proc procedure to run immediately, then once every hour after that.

BEGIN
DBMS_JOB.isubmit (
job => 99,
what => 'my_job_proc(''DBMS_JOB.ISUBMIT Example.'');',
next_date => SYSDATE,
interval => 'SYSDATE + 1/24 /* 1 Hour */');

COMMIT;
END;
/

 

--
--  Schedule a snapshot to be run on this instance every hour
 
variable jobno number;
variable instno number;
begin
 
  select instance_number into :instno from v$instance;
-- ------------------------------------------------------------
-- Submit job to begin at 0600 and run every hour
-- ------------------------------------------------------------
dbms_job.submit(
   :jobno, 'BEGIN statspack_alert_proc; END;',
   trunc(sysdate)+6/24,
   'trunc(SYSDATE+1/24,''HH'')',
   TRUE,
   :instno);
 
-- ------------------------------------------------------------
-- Submit job to begin at 0900 and run 12 hours later
-- ------------------------------------------------------------
dbms_job.submit(
   :jobno,
   'BEGIN statspack_alert_proc; END;',
   trunc(sysdate+1)+9/24,
   'trunc(SYSDATE+12/24,''HH'')',
   TRUE,
   :instno);
 
-- ------------------------------------------------------------
-- Submit job to begin at 0600 and run every 10 minutes
-- ------------------------------------------------------------
dbms_job.submit(
:jobno,
'BEGIN statspack_alert_proc; END;',
trunc(sysdate+1)+6/24,
'trunc(sysdate+1/144,''MI'')',
TRUE,
:instno);
 
-- ----------------------------------------------------------
-- Submit job to begin at 0600 and run every hour, Monday - Friday
-- ---------------------------------------------------------
dbms_job.submit(
:jobno,
'BEGIN statspack_alert_proc; END;',
trunc(sysdate+1)+6/24,
‘trunc(
  least(
   next_day(SYSDATE - 1,'’MONDAY'’),
   next_day(SYSDATE - 1,'’TUESDAY'’),
   next_day(SYSDATE - 1,'’WEDNESDAY'’),
   next_day(SYSDATE - 1,'’THURSDAY'’),
   next_day(SYSDATE - 1,'’FRIDAY'’)
)
+1/24,'’HH'’)',
TRUE,
:instno);

commit;
end;
/

 


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Note: This Oracle documentation was created as a support and Oracle training reference for use by our DBA performance tuning consulting professionals. 
Feel free to ask questions on our Oracle forum.

Verify experience! Anyone considering using the services of an Oracle support expert should independently investigate their credentials and experience, and not rely on advertisements and self-proclaimed expertise. All legitimate Oracle experts publish their Oracle qualifications.

Errata?  Oracle technology is changing and we strive to update our BC Oracle support information.  If you find an error or have a suggestion for improving our content, we would appreciate your feedback.  Just  e-mail:  and include the URL for the page.
 
 


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