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Oracle News Headlines


Scripts Developed for New dbms_scheduler Utility
November 1
, 2004

Oracle Guru Jim Czuprynski has just published a good article on the exciting new dbms_scheduler package:
Jim notes that dbms_scheduler is far more powerful than the dbms_jobs package and he provides some very useful techniques and scripts:
Basic Task Scheduling. First off, fear not! The Scheduler does keep the basic functionality of DBMS_JOB intact:
  • A task can be scheduled to run at a particular date and time.
  • A task can be scheduled to run only once, or multiple times.
  • A task can be turned off temporarily or removed completely from the schedule.
  • Complex scheduling is still available, but now much simpler. (For example, DBMS_JOB could be manipulated into running a task every Tuesday, Thursday and Saturday at 08:00, but it did take some experimentation with NEXT_DATE and the INTERVAL parameter of DBMS_JOB before I got it right.)
Jim also has a follow-up article that shows even more powerful dbms_scheduler features:
Best of all, Czuprynski shows a suggested series of steps for converting from dbms_jobs to dbms_scheduler:
Transitioning from DBMS_JOB to DBMS_SCHEDULER

To make the transition from using DBMS_JOB to DBMS_SCHEDULER, I suggest the following steps:

  • Identify all currently active scheduled tasks that were scheduled via DBMS_JOB, including their scheduled run times.
  • Analyze these tasks and identify any "overlaps" among the DBMS_JOB scheduled tasks. These overlaps might include identical tasks being run at different times; tasks being run in parallel; or tasks being run serially.
  • Convert tasks scheduled via DBMS_JOB into their corresponding DBMS_SCHEDULER components (program, schedule, and job objects):

    "Break" the currently scheduled task to make sure that duplicate tasks don't fire off at the same time:

    • If the task is essentially a stand-alone task, use DBMS_SCHEDULE.CREATE_JOB to create a new instance of the task.
    • If several tasks can benefit from reuse, then, use DBMS_SCHEDULE.CREATE_JOB, DBMS_SCHEDULE.CREATE_PROGRAM, and DBMS_SCHEDULE.CREATE_JOB to create the required components and start them running on schedule.
  • Once the conversion is complete, then remove all the tasks using DBMS_JOB.REMOVE:.


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