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Oracle10g Grid Computing with RAC
Chapter 17 -
Oracle’s Grid Integration Technologies

Scheduler Components

The Scheduler has the following components:

  • Schedule: This specifies when and how many times a job is executed.

  • Program: This is a collection of metadata about what is run by the schedule.  A program can be a PL/SQL procedure, an executable C program, a Shell script, or a java application, and so on.  You can specify a list of arguments for a program.

  • Job: This specifies what (program) needs to execute and at what time (schedule).  A job class defines a category of jobs that share common resource usage requirements and other characteristics.

  • Window: A window is represented by an interval of time with a well-defined beginning and end.  It is used to activate different resource plans at different times.  A window group represents a list of windows.

Create, Enable, Disable, and Drop a Program

You can use the dbms_scheduler.create_program procedure to create a program.  As mentioned previously, a program is a collection of metadata about what is to be run by the Scheduler.  To create a program using dbms_scheduler is really just to register a program with the Scheduler.

The syntax for creating a program using the Scheduler is as follows:

 Program_name           in varchar2,
 Program_type           in varchar2,
 Program_action         in varchar2,
 Number_of_auguments    in pls_integer default 0,
 Enable                 in Boolean default false,
 Comments               invarchar2 default null

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