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Learn complex job management with dbms_scheduler

Dr. Tim Hall’s book “Oracle Job Scheduling” has become the best source for complex job scheduling, a very important feature for Oracle systems that traditionally used UNIX crontabs to schedule batch jobs.

Yak Shaving also has outstanding instructions for scheduling batch jobs in his blog, with superb working examples:

“Oracle database offers a job queue for scheduling certain operations to happen routinely in a database. The functionality is similar to UNIX cron jobs with the primary difference being if your database is not running, the job will not attempt to run.

Scheduling is accomplished through the DBMS_JOB package which is provided by Oracle. While nearly anything can be scheduled, my rule of thumb is to use this only for things which happen exclusively within the database. For tasks which involve manipulating files at the operating system level I still prefer cron.

Oracle will start a coordinator job queue (CJQ0) process to handle scheduled jobs. The CJQ0 process will keep track of the schedule and start helper processes (J000 – J999) to execute the scheduled jobs (sic).”


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