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As I mentioned earlier in this chapter, the CBO doesn t always use the same execution strategies. Changes in Oracle versions or changes in the initialization parameters concerning memory allocation may force the CBO to modify its plans. You can use Oracle s plan stability feature to ensure that the execution plan remains stable regardless of any changes in the database environment. The plan stability feature uses stored outlines to preserve the current execution plans, even if the statistics and Optimizer mode are changed. The CBO uses the same execution plan with identical access paths each time you execute the same query. The catch is that the query must be exactly identical each time if you want Oracle to use the stored plan.

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.

Caution When you use stored outlines to preserve a currently efficient execution plan, you re limiting Oracle s capability to modify its execution plans dynamically based on changes to the database environment and changes to the statistics. Ensure you use this feature for valid purposes, such as maintaining similar plans for distributed applications.

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.

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The simplest NTP topology involves a single NTP server synchronizing the clocks of all other NTP devices In the case of a private dedicated NTP server that s capable of servicing thousands of clients, the use of a single server approach (without any intervening higherstratum servers to create an NTP hierarchy) may work quite well even for larger networks Some degree of traffic analysis may be appropriate to ensure that the NTP traffic between the server and all of the other clients will not disrupt regular network operations The rule-of-thumb formula regarding the relationship between NTP topology and the number of clients is to use point-to-point topology (unicast client/server exchanges) at the top of the NTP hierarchy while relying more on broadcast, multicast, and anycast/ manycast (point-to-multipoint and multipoint-to-point) operations as the hierarchy progresses outward toward the end users.

On the face of it, the stored outline feature doesn t seem impressive. Let s consider a simple example to see how a stored outline could be useful in a real production environment. Suppose you have a system that s running satisfactorily and, due to a special need, you add an index to a table. The addition of the new index could unwittingly modify the execution plans of the CBO, and your previously fast-running SQL queries may slow down. It could conceivably take a lot of effort, testing, and time to fix the problem by changing the original query. However, if you had created stored outlines, these kinds of problems wouldn t arise. Once Oracle creates an outline, it stores it until you remove it. In the next section you ll examine how to implement planned stability in a database.

You create a Scheduler job using the CREATE_JOB procedure of the DBMS_SCHEDULER package. Listing 18-17 shows a simple example of how to create a basic Scheduler job, without using a program or schedule. This is the most straightforward way to specify a job, with all pertinent information being specified in the job-creation statement itself, without using programs and schedules. Listing 18-17. Creating a Basic Scheduler Job Without a Program or Schedule SQL> BEGIN 2 DBMS_SCHEDULER.CREATE_JOB( 3 JOB_NAME => 'test_job', 4 JOB_TYPE => 'PLSQL_BLOCK', 5 JOB_ACTION => 'insert into persons select * from new_persons;', 6 START_DATE => '28-JUNE-08 07.00.00 PM ', 7 REPEAT_INTERVAL => 'FREQ=DAILY; INTERVAL=2', 8 END_DATE => '20-NOV-08 07.00.00 PM ', 9 COMMENTS => 'Insert new customers into the persons table', 10 ENABLED => TRUE, 11* END; / PL/SQL procedure successfully completed. SQL>

Note You ll be the owner of a job if you create it in your own schema. However, if you create it in another schema, that schema owner will be the owner of the job. Thus, the fact that you create a job doesn t mean that you are necessarily its owner.

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