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Oracle Job Scheduling

Chapter 1 - Overview of Oracle Job Scheduling

Migrating from dbms_job to dbms_scheduler

-- New scheduler.

BEGIN
  DBMS_SCHEDULER.create_job (
    job_name        => 'dummy_job',
    job_type        => 'PLSQL_BLOCK',
    job_action      => 'BEGIN NULL; /* Do Nothing */ END;',
    start_date      => SYSTIMESTAMP,
    repeat_interval => 'SYSTIMESTAMP + 1 /* 1 Day */');
END;
/

By comparing these examples, it is noted that conversion of basic jobs is quite simple, involving the following steps:

  • Define a meaningful job_name for the new job.
     

  • Assign a job_action of PLSQL_BLOCK.
     

  • Use the what value from the old job as the job_action value in the new job.
     

  • Use SYSTIMESTAMP for the start_date value.
     

  • Use the interval value from the old job as the repeat_interval value in the new job, making sure the result of the expression is a TIMESTAMP not a DATE.

Once this conversion has been completed for all jobs, there is freedom from using the old scheduler, so the job_queue_processes parameter can now be set to zero.


The above text is an excerpt from:


Oracle Job Scheduling
Creating Robust Task Management with dbms_job and Oracle10g dbms_scheduler

ISBN 0-9744486-6-4

by Dr. Timothy S. Hall
 

http://www.rampant-books.com/book_2005_1_scheduling.htm


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