Book Image

Mastering Oracle Scheduler in Oracle 11g Databases

By : Ronald Rood
Book Image

Mastering Oracle Scheduler in Oracle 11g Databases

By: Ronald Rood

Overview of this book

Scheduler (DBMS_SCHEDULER) is included in Oracle Database and is a tool for the automation, management, and control of jobs. It enables users to schedule jobs running inside the database such as PL/SQL procedures or PL/SQL blocks, as well as jobs running outside the database like shell scripts. Scheduler ensures that jobs are run on time, automates business processes, and optimizes the use of available resources. You just need to specify a fixed date and time and Scheduler will do the rest. What if you don't know the precise time to execute your job? Nothing to worry about, you can specify an event upon which you want your job to be done and Scheduler will execute your job at the appropriate time. Although scheduling sounds quite easy, it requires programming skills and knowledge to set up such a powerful, intelligent scheduler for your project. This book is your practical guide to DBMS_SCHEDULER for setting up platform-independent schedules that automate the execution of time-based or event-based job processes. It will show you how to automate business processes, and help you manage and monitor those jobs efficiently and effectively. It explains how Scheduler can be used to achieve the tasks you need to make happen in the real world. With a little understanding of how the Scheduler can be used and what kind of control it gives, you will be able to recognize the real power that many known enterprise-class schedulers ñ with serious price tags ñ cannot compete with. You will see how running a specific program can be made dependent on the successful running of certain other programs, and how to separate various tasks using the built-in security mechanisms. You will learn to manage resources to balance the load on your system, and gain increased database performance.
Table of Contents (15 chapters)
Mastering Oracle Scheduler in Oracle 11g Databases
About the Author
About the Reviewers


In this chapter, we examined the various uses of Oracle Scheduler and, ultimately, the power of the Oracle Scheduler when used in real-world scenarios.

We covered:

  • How to dequeue the Scheduler event queue

  • How to save the events for debugging

  • How to specify job_weight for a job with parallelism

  • How to specify job_priority

  • How to specify max_job_duration

  • How to specify which events should be generated by a job

  • How to interpret job_completed

  • How to make use the max_runs job attribute

  • How to make use the end_date job attribute

  • How to make use of the auto_drop job attribute

  • How to generate the job names using a prefix

  • How to use the Scheduler for advanced backup setups

  • How to use the Scheduler to generate object statistics without impacting the other users

  • How to create a schedule

  • How to combine schedules to make advanced schedules

There seems to be only one limitation of the Oracle Scheduler—our lack of imagination to make it work to its full advantage. I hope now it's overcome. The only known limitation...