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

Problems with Resource Manager

There are a few things to keep in mind when you want to make real use of the Scheduler and want it to be controlled by Resource Manager. Sometimes it so happens that a system is idle, which means it's not using much CPU, and still your jobs are not started. Or it could also be that all of a sudden the jobs stop getting started without any modification of jobs or resource plans at all. These are nasty situations. To start with, make sure that every patch for Resource Manager is applied. For Oracle, start with the patch for bug 7482069, which is a collection of fixes for Resource Manager and is generic for all platforms.

Also, check the alert log during instance start and also check if the NUMA setting fits your system. By default, Oracle enables NUMA optimization in This can have side effects that are not always positive, especially when your system does not happen to be a NUMA system. NUMA stands for Non Uniform Memory Architecture, which...