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

Preparing the database for remote agent usage

There are a few things to check and do before we can use the remote job agent. The following steps will be explained in detail:

  1. 1. Verify that XDB is installed.

  2. 2. Set HTTP port, if not set.

  3. 3. Install the remote job agent objects.

  4. 4. Set the registration password.

Verifying the XDB installation

In order to use a remote Scheduler, the database needs to have XML database installed.

Check this by verifying dba_registry for the existence and validity of the comP_id 'XDB' as follows:

In this case, the XML Database is installed and valid.

Setting the HTTP port

The agent uses the database's HTTP port to contact the database. Check which port is in use and set a port if needed. As with the agent, make sure that the port is above 1023, as the lower ports are reserved for the root. There is not much to say about which port is good or bad, but don't take the port that the remote job agent is listening on. As we poor humans have trouble remembering simple numbers...