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Oracle dbms_job example

Oracle Tips by Burleson Consulting
Don Burleson

For more Oracle dbms_job 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.

The Oracle docs note the following about the dbms_job package:

"The DBMS_JOB package has been superseded by the DBMS_SCHEDULER package. In particular, if you are administering jobs to manage system load, you should consider disabling DBMS_JOB by revoking the package execution privilege for users. "

For Oracle10g see Oracle dbms_scheduler examples.


 

 


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 dbms_job 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 use dbms_job to start a job at 8:00 AM, run it hourly, and then stop at 5:00 PM?

The example about will use dbms_job to 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 8:00 AM.

For advanced scheduling purposes we can create customized job intervals using dbms_job 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;
/
 
 

For more information on Oracle DBMS_JOB see the following links:

Oracle DBMS_JOB.BROKEN
Oracle DBMS_JOB.REMOVE
Oracle DBMS_JOB vs. Oracle DBMS_SCHEDULER
Advanced Job Scheduling with Oracle dbms_job
The DBMS_JOB Package
DBMS_JOB Package Tips
Migrating from dbms_job to dbms_scheduler
Data Dictionary Views Related to dbms_job
Overview and Examples of dbms_job Functions
Oracle dbms_job example




 

 

 

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