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A job class groups a set of jobs that share common characteristics, such as resource requirements. Job classes enable you to allocate resources among jobs by grouping similar types of jobs together. You use job classes to do a couple of things: Assign job priority levels for individual jobs, with a higher-priority job always starting before a lower-priority job Specify common attributes for a set of jobs You use the Database Resource Manager in coordination with the Scheduler to allocate scarce resources in your database. In the Database Resource Manger, the concept of a resource consumer group lets you group users according to their resource usage. Oracle controls resource allocation by assigning each job class to a specific resource consumer group. By default, a job class is assigned to the default consumer group.
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Scheduler windows offer a link to the Oracle Resource Manager. A window represents an interval of time during which you can schedule jobs, and the purpose of using windows is to change resource allocation during specific time periods. Each window is associated with a specific resource plan, which you create through the Database Resource Manager. Using windows, you can activate different resource plans during different time periods, thus providing differential prioritizing for jobs.
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A window group is a collection of similar windows. For example, you can create a window for your weekends and a window for your holidays and group both these windows into a single maintenance window group.
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The Scheduler architecture consists of the job table, job coordinator, and the job workers (or slaves, as Oracle calls them).
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CHAPTER 18 MANAGING AND MONITORING THE OPERATIONAL DATABASE
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The job table contains information about jobs, such as the job name, program name, and job owner. You can examine the job table by using the DBA_SCHEDULER_JOBS view. The job coordinator regularly looks in the job table to find out what jobs to execute. The job coordinator creates and manages the job worker processes, which actually execute the job. When you create a new job or execute a job, a background process (cjqnnn) wakes up and coordinates the running of the job. When the job coordinator tells a job worker to execute a job, the worker process starts a new database session and starts a transaction. It executes the job, and once completed, it commits and ends the transaction and terminates the database session. The job worker updates the job table, the run count, and the job log table.
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Scheduler Privileges
Oracle creates all jobs, programs, and schedules in the schema of the user that creates these objects, but it creates all the advanced Scheduler components, like job classes, windows, and window groups, at the database level, and their owner is the SYS schema. The SCHEDULER_ADMIN role contains all Scheduler system privileges, with the WITH ADMIN OPTION clause. The DBA role contains the SCHEDULER_ADMIN role. The MANAGE SCHEDULER system privilege lets you do the following: Create, drop, and alter job classes, windows, and window groups Stop any job Start and stop windows prematurely
Note
All Scheduler objects are of the form [schema.]name. By default, all scheduler object names are in uppercase, unless you wrap the lowercase names in double quotes, as in "test_job".
You must have the CREATE JOB privilege to create Scheduler components (jobs, schedules, programs, chains, and events). To use the advanced Scheduler components (windows, window groups, and job classes), you need the MANAGE SCHEDULER system privilege. You can assign other users the right to use one of your components by giving them EXECUTE privileges on that component: The EXECUTE ANY PROGRAM privilege lets a user execute any program under any schema. The EXECUTE ANY CLASS privilege lets you assign a job to any job class. In order for users to modify Scheduler components, they must use the GRANT ALTER SQL statement for each Scheduler component.
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