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In many cases, the middleware buffers incoming notifications, handling delivery asynchronously with respect to the true event source This way, the actual event source is not affected by the rate at which subscribers receive or handle notifications Directdelivery systems rarely deliver notifications asynchronously, because it s too complicated to have each event source deal with notification buffers, delivery threads, and the associated synchronization logic Firing an event is conceptually a fairly simple affair: The event source has a list of subscribers and their subscriptions The subscriptions may identify events by type, channel, or other means, using one of the subscription models described in 2 When the event source detects an event, it checks to see if there are any subscribers to the event If there aren t, no further action is taken.

You use external jobs to run operating system executables outside the database. You specify the JOB_TYPE as EXECUTABLE for external jobs.

You use a detached job to run a script or application as an independent process. The program for a detached job has the DETACHED attribute set to TRUE.

The absence of subscribers is not typically an error condition for an event source and may not even be an unusual situation Assuming there are subscribers, the event source creates a notification payload and sends it to each subscriber Although the steps are straightforward, there are a number of details that you must consider, which is what the rest of this chapter is about For example, consider notifications designed to fetch a value from subscribers What should you do if there are no subscribers Another problem might be this: What happens when an exception occurs while firing a multicast event As always, the devil is in the details Event firing entails the following two phases on the event source: 1 Determining whether the preconditions for firing the event are satisfied 2 Delivering the notification Each phase may be broken down further.

Lightweight jobs are different from regular Scheduler jobs in that they depend on a template to derive their privileges and the job metadata. Lightweight jobs involve less overhead and are quick to create and drop, thus making them ideal when you have a large number of short jobs to run. Unless otherwise specified, when I refer to a database job (regular jobs), I mean the regular Scheduler job and not a specialized type of job such as an external or lightweight job. I explain the various types of Scheduler jobs in more detail in this chapter.

In addition to the five basic Scheduler components jobs, schedules, programs, chains, and events the Scheduler also uses several advanced concepts: job classes, windows, and window groups. These advanced features set apart the Scheduler from its predecessor, the DBMS_JOB package. It s these advanced concepts that enable the prioritizing of jobs in the database and the allocation of resources in accordance with the organization s priorities. Let s look at the advanced Scheduler components briefly.

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 Manager, 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.

If you denote the event with E, step 1 entails the following conditions: 1 The conditions that define E are detected 2 E has at least one subscriber 3 The event source knows how to fire events..

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