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CHAPTER 18 MA NA GING AND M ONITORING THE OPERATIONA L DATABA SE
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You can see which window is currently active and which resource plan is associated with that window by using the following query: SQL> SELECT window_name, resource_plan, enabled, active 2 FROM DBA_SCHEDULER_WINDOWS; WINDOW_NAME -------------------TEST_WINDOW . . . SQL> RESOURCE_PLAN -----------------TEST_RESOURCEPLAN ENABLED -------TRUE ACTIVE ------FALSE
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You can see that the window TEST_WINDOW is enabled, but not currently active.
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Creating a Window
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You create a window by using the CREATE_WINDOW procedure. Let s look at two examples using this procedure, one with an inline specification of the start and end times and the repeat interval, and the other where you use a saved schedule instead to provide these three scheduling attributes. In the first example, the window-creation statement specifies the schedule for the window: SQL> BEGIN DBMS_SCHEDULER.CREATE_WINDOW( WINDOW_NAME => 'MY_WINDOW', START_DATE => '01-JUN-08 12:00:00AM', REPEAT_INTERVAL => 'FREQ=DAILY', RESOURCE_PLAN => 'TEST_RESOURCEPLAN', DURATION => interval '60' minute, END_DATE => '31-DEC-08 12:00:00AM', WINDOW_PRIORITY => 'HIGH', COMMENTS => 'Test Window'); END; Let s look at the individual attributes of the new window created by the preceding statement: RESOURCE_PLAN: This attribute specifies that while this window is open, resource allocation to all the jobs that run in this window will be guided by the resource plan directives in the TEST_RESOURCEPLAN resource plan. WINDOW_PRIORITY: This attribute is set to HIGH, and the default priority level is LOW; these are the only two values possible. If two windows overlap, the window with the high priority level has precedence. Since only one window can be open at a given time, when they overlap, the highpriority window will open and the low-priority window doesn t open. START_DATE: The setting for this attribute specifies that the window first becomes active at 12:00 a.m. on June 1, 2008. You can also say that the window will open at this time. DURATION: This attribute is set so that the window will remain open for a period of 60 minutes, after which it will close. REPEAT_INTERVAL: This attribute specifies the next time the window will open again. In this example, it is 12:00 a.m. on June 2, 2008. END_DATE: This attribute specifies that this window will open for the last time on December 31, 2008, after which it will be disabled and closed.
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CH A PT ER 1 8 M ANA GIN G AN D MON IT O RING TH E O PERA TI ON AL D AT AB ASE
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Since the Scheduler doesn t check to make sure that there are prior windows for any given schedule, windows can overlap sometimes.
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The following example creates a window using a saved schedule. Obviously, it is much simpler to create a window this way: SQL> BEGIN DBMS_SCHEDULER.CREATE_WINDOW( WINDOW_NAME => 'TEST_WINDOW', SCHEDULE_NAME => 'TEST_SCHEDULE', RESOURCE_PLAN => 'TEST_RESOURCEPLAN', DURATION => interval '180' minute, COMMENTS => 'Test Window'); END; In the preceding CREATE_WINDOW procedure, the use of the TEST_SCHEDULE schedule lets you avoid specifying the START_DATE, END_DATE, and REPEAT_INTERVAL parameters.
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A window is automatically enabled upon creation.
Once you create a window, you must associate it with a job or job class, so the jobs can take advantage of the automatic switching of the active resource plans.
Managing Windows
You can open, close, alter, enable, disable, or drop a window using the appropriate procedure in the DBMS_SCHEDULER package, and you need the MANAGE SCHEDULER privilege to perform any of these tasks. Note that since all windows are created in the SYS schema, you must always use the [SYS].window_name syntax when you reference any window. A window will automatically open at a time specified by its START_TIME attribute. You can also open a window manually anytime you wish by using the OPEN_WINDOW procedure. Even when you manually open a window, that window will still open at its regular opening time as specified by its interval. Here s an example that shows how you can open a window manually: SQL> EXECUTE DBMS_SCHEDULER.OPEN_WINDOW( WINDOW_NAME => 'BACKUP_WINDOW', DURATION => '0 12:00:00'); SQL> Look at the DURATION attribute in the preceding statement. When you specify the duration, you can specify days, hours, minutes, and seconds, in that order. Thus, the setting means 0 days, 12 hours, 0 minutes, and 0 seconds. You can also open an already open window. If you do this, the window will remain open for the time specified in its DURATION attribute. That is, if you open a window that has been running for 30 minutes, and its duration is 60 minutes, that window will last be open for the initial 30 minutes plus an additional 60 minutes, for a total of 90 minutes. To close a window, you use the CLOSE_WINDOW procedure, as illustrated by the following example: SQL> EXECUTE DBMS_SCHEDULER.CLOSE_WINDOW('BACKUP_WINDOW');
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