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Since windows might have overlapping schedules, you may frequently have more than one window open at the same time, each with its own resource plan. At times like this, the Scheduler will close all windows except one, using certain rules of precedence. Here is how the precedence rules work: If two windows overlap, the window with the higher priority opens and the window with the lower priority closes. If two windows of the same priority overlap, the active window remains open. If you are at the end of a window and you have other windows defined for the same time period with the same priority, the window that has the highest percentage of time remaining will open.

A window group is a collection of windows, and it is part of the SYS schema. Window groups are optional entities, and you can make a window a part of a window group when you create it, or you can add windows to a group at a later time. You can specify either a single window or a window group as the schedule for a job. As explained earlier in this chapter, you can take two or more windows that have similar characteristics for example, some night windows and a holiday window and group them together to create a downtime window group. Window groups are used for convenience only, and their use is purely optional.

SyncLock (incomingMessages) incomingMessages.Enqueue(item) End SyncLock End Sub End Class The code examples don t show the actual details of message transmission, since they are implementation-dependent and not terribly important for this discussion. MessageQueue keeps messages in an in-memory queue. To improve reliability of delivery, the MessageQueue could save queued messages in a persistent store, such as a file system or a database. This way, messages could be recovered if the system crashed or was shut down while messages were in the queue.

In earlier sections in this chapter, you ve seen how you can use the SET_ATTRIBUTE procedure to modify various components of the Scheduler. Attributes like JOB_NAME and PROGRAM_NAME are unique to the job and program components. You can retrieve the attributes of any Scheduler component with the GET_SCHEDULER_ATTRIBUTE procedure of the DBMS_SCHEDULER package.

You can use the SET_ATTRIBUTE_NULL procedure to set a Scheduler component s attributes to NULL. For example, to unset the COMMENTS attribute of the TEST_PROGRAM program, you can use the following code: SQL> EXECUTE dbms_scheduler.SET_ATTRIBUTE_NULL('TEST_PROGRAM', 'COMMENTS');

There are some attributes that are common to all Scheduler components. The SET_SCHEDULER_ ATTRIBUTE procedure lets you set these common, or global, attribute values, which affect all Scheduler components. The common attributes include the default time zone, the log history retention period, and the maximum number of job worker processes.

When delivering event notifications using PCs, four variations can occur, depending on the location of the sender with respect to the receiver, and on the timing of the call. A PC can be either local or remote, and either synchronous or asynchronous.

There are several dynamic performance views you can use to monitor Scheduler jobs, and I briefly discuss the important views here.

The DBA_SCHEDULER_JOBS view provides the status and general information about scheduled jobs in your database. Here s a simple query using the view: SQL> SELECT job_name, program_name 2 FROM DBA_SCHEDULER_JOBS; JOB_NAME ----------------PURGE_LOG GATHER_STATS_JOB . . . SQL> PROGRAM_NAME ----------------PURGE_LOG_PROG GATHER_STATS_PROG

You can use the DBA_SCHEDULER_JOB_RUN_DETAILS view to check the status and the duration of execution for all jobs in your database, as the following example shows: SQL> SELECT job_name, status, run_duration 2* FROM DBA_SCHEDULER_JOB_RUN_DETAILS; JOB_NAME ----------------PURGE_LOG PURGE_LOG GATHER_STATS_JOB SQL> STATUS ---------SUCCEEDED SUCCEEDED SUCCEEDED RUN_DURATION ------------+000 00:00:02 +000 00:00:04 +000 00:31:18