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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.

If the purpose of a notification is to send information to subscribers, and there are none, the publisher can simply do nothing: It doesn t send the notification. Things are different if a notification allows subscribers to return data to the publisher. For example, say an event source fires an event to retrieve an integer value from each event target. If there are no targets, what should the system do The primary purpose of events is to push information from the event source to the event target, so it might appear that using notifications to retrieve data is a design flaw. This may indeed be the case. On the other hand, event notifications are an excellent decoupling mechanism for objects that are part of the same local system, so you might use them in a pull mode, with the sole aim of reducing coupling between the event source and the event target. In pull mode, notifications simply replace direct procedure calls between source and target. The event source now relies on the presence of event targets to carry out its job. If no targets are available when the event needs to be fired, it means the system is probably not wired correctly and might have to be stopped. Alternatively, if a default value exists, the system might carry on using the default value.

To be able to create a job in a job class you generate, you must have a separate EXECUTE privilege on that

Note the following basic points regarding Scheduler privileges: To create a job, you must have the CREATE JOB privilege. You don t need any special privileges to specify a schedule, a window or window group, or a program that you own. If you specify a program owned by a different user, you must have the EXECUTE privilege on that program, or the EXECUTE ANY PROGRAM system privilege.

The basic Scheduler components jobs, programs, schedules, chains, and events have several common manageability features. You create, alter, and drop all the components with the same procedure from the DBMS_SCHEDULER package. The following sections describe how to manage these components.

The notification payload is the information carried by a notification to subscribers. When notifications are sent using PCs, the payload is represented by the parameters passed as arguments in the procedure call. The call itself is the notification, and the call might have no parameters, in which case the notification has no payload. In a large percentage of cases, notifications do have a payload. When a payload is required, you need to package it in a manner suitable for transmission to subscribers. Packaging may entail serializing objects into a binary stream, converting an object into XML, or other. When transferring data in binary format, it is important to be clear about how multibyte numbers are represented. In the little-endian format, the least significant byte of a multibyte value is sent first. In the big-endian format, the most significant byte is sent first. Some middleware messaging systems can handle both formats. A message property would then be necessary to tell subscribers which endian format is used.

Creating and managing jobs is at the heart of the Scheduler feature. You can create and run jobs independently, or you can create a job using schedules and programs. Using saved programs and schedules saves you having to redefine a program or schedule each time you create a new job.