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So far, you ve seen how to create jobs with and without a schedule. When you create a job without a schedule, you ll have to provide the start time and the frequency, whereas using a schedule enables you to omit these from a job specification. In both cases, the job timing is based on calendar time. However, you can create both jobs and schedules that are based strictly on events, not calendar time. We ll briefly look at event-based jobs and schedules in the following sections.

The following example shows how to create a Scheduler job using a program and an event. The job will start when the event, FILE ARRIVAL, occurs: SQL> BEGIN dbms_scheduler.create_job( JOB_NAME => test_job, PROGRAM_NAME => test_program, START_DATE => '01-AUG-08 5.00.00AM US/Pacific', EVENT_CONDITION => 'tab.user_data.event_name = ''FILE_ARRIVAL''', QUEUE_SPEC => 'test_events_q' ENABLED => TRUE, COMMENTS => 'An event based job'); END;

Rendezvous doesn t support transactions directly. A separate product, called Rendezvous TX (RVTX), supports transactions using a centralized server architecture.

There are two unfamiliar attributes in the preceding CREATE_JOB procedure, both of which are unique to event-based jobs: EVENT_CONDITION: The EVENT_CONDITION attribute is a conditional expression that takes its values from the event source queue table and uses Oracle Streams Advanced Queuing rules. You specify object attributes in this expression and prefix them with tab.user_data. Review the DBMS_AQADM package to learn more about Oracle Streams Advanced Queuing and related rules. QUEUE_SPEC: The QUEUE_SPEC attribute determines the queue into which the job-triggering event will be queued. In the preceding example, test_events_q is the name of the queue.

The following example shows how to create an event-based schedule. Whenever an event (FILE_ARRIVAL) occurs, the Scheduler will start a job based on the schedule created in this example. In this case, the event indicates that a file has arrived before noon. SQL> BEGIN dbms_scheduler.create_event_schedule( SCHEDULE_NAME => 'appowner.file_arrival', START_DATE => systimestamp, EVENT_CONDITION => 'tab.user_data.object_owner = ''APPOWNER'' AND tab.user_data.event_name = ''FILE_ARRIVAL'' AND extract hour FROM tab.user_data.event_timestamp < 12', QUEUE_SPEC => 'test_events_q'); END; You were introduced to the EVENT_CONDITION and QUEUE_SPEC attributes in the previous example.

RV interoperates with other TIBCO messaging systems, such as SmartSockets and TIBCO Enterprise for JMS. Interoperability with non-TIBCO systems is accomplished using special adapters. A tool is available for building customized adapters.

So far, you ve learned how to manage the basic Scheduler components jobs, programs, schedules, chains, and events. In this section, let s look at how to manage the advanced Scheduler components job classes and windows (and window groups). You ll also learn how the Scheduler makes good use of the Database Resource Manager features, such as resource consumer groups and resource plans, to efficiently allocate scarce OS and database resources. Too often, heavy batch jobs run past their window and spill over into the daytime, when OLTP transactions demand the lion s share of the resources. Prioritizing jobs to ensure that they are guaranteed adequate resources to perform along accepted lines is an essential requirement in production databases. The Scheduler uses the concepts of job classes and windows to prioritize jobs.

Using job classes helps you prioritize jobs by allocating resources differently among various groups of jobs. The scheduler associates each job class with a resource consumer group, which lets the Scheduler determine the appropriate resource allocation for each job class. The ability to associate job classes with the resource consumer groups created by the Database Resource Manager helps in prioritizing jobs.

All jobs must belong to a job class. There is a default job class, DEFAULT_JOB_CLASS, to which all jobs will belong by default, if they aren t assigned to any other job class. A job class will be associated with the DEFAULT_ CONSUMER_GROUP by default if you don t expressly assign it to a specific resource consumer group.

Client applications interact with RV exclusively via the RV daemons and routers. Programming APIs are available for the following languages and component platforms: .NET C, C++ Java ActiveX TIBCO Rendezvous runs on all major platforms, including Windows, Unix, and VMS.