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Oracle Database 11g offers the new built-in Scheduler feature that helps you automate jobs from within the Oracle database. The DBMS_SCHEDULER package contains various functions and procedures that help manage the Scheduler, although you can also schedule jobs very easily through the Database Control interface as well. The most important architectural feature of the Scheduler is its modular approach to managing tasks, which enables the reuse of similar jobs. You can also use the Scheduler along with the Database Resource Manager to fine-tune the allocation of resources among various jobs. The Scheduler is not only a job-specification tool; it also helps you control resource usage and prioritize jobs within the database. One of the limitations of the DBMS_JOB package is that it can only schedule PL/SQL-based jobs, and you can t use it to schedule operating system scripts or an executable. To run these non-databasetype jobs, you must use the crontab in UNIX or the AT facility in Windows servers, or a third-party tool. The Oracle Scheduler lets you use PL/SQL scripts, operating system shell scripts, Java programs, and native binary executables to perform scheduled jobs.

Timer +Start()

The Scheduler consists of five basic components jobs, schedules, programs, events, and chains. Jobs are pretty similar to the jobs used in the DBMS_JOB package, but schedules, programs, events, and chains are new concepts, leading to a modular approach to the management of tasks. A program, for example, enables several users to perform similar tasks. Let s examine the basic Scheduler components in more detail.

A job is a task that you schedule to run one or more times A job contains a specification of what is to be executed, and when it should be executed. A Scheduler job can execute a PL/SQL block of code, a native binary executable, a Java application, or a shell script. You can create a new job by specifying the job details such as the actions that the job performs and time and frequency of the execution,

just as you can with the traditional DBMS_JOB package. In the Scheduler, you can abstract all the job execution and timing details by using the program and schedule modules.

Figure 7-70. The class diagram for two decoupled classes When the Scheduler fires a ProcessStarted event, the Scheduler doesn t know that the event causes a Timer s Start method to be called. It doesn t know anything about the Timer class, and this is good. If a manufacturer decides to market the Scheduler as a component, the part can be sold and used not only by Timer components, but also with many others.

A schedule is a specification of when and how frequently the database executes a job. You can use the same schedule for several jobs. You can also have schedules that specify job execution when a specific event occurs in the database.

A program contains metadata about a Scheduler job. A program includes the program name, the program type (PL/SQL code or a UNIX shell script, for example), and the program action, which is the actual name of a procedure or executable script, for example. Several jobs can use the same program. Note that a job can specify what the job is executing directly in the job definition, or it can use a preexisting program for that purpose.

The Scheduler uses the Oracle Streams Advanced Queuing feature to raise events and start database jobs based on the events. An event is a message sent by an application or process when it notices some action or occurrence. There are two types of events Scheduler-raised events and application-raised events. Schedulerraised events are caused by changes in the functioning of the Scheduler, so the successful completion of a job by the Scheduler may be an event. Application-raised events are consumed or used by the Scheduler to start a job. In fact, you have the option of using just an event instead of a schedule as the means of starting a job. You can also base a schedule on an event, in which case the schedule is known as an event schedule.

Summary