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You use the DBMS_SCHEDULER package to perform job-related administrative tasks. You can enable, and thus activate, a job as follows: SQL> EXEC DBMS_SCHEDULER.ENABLE('TEST_JOB1'); PL/SQL procedure successfully completed.

If you don t set the MEMORY_TARGET parameter, it will default to a value of zero and the following will be true of the SGA and PGA allocations: If you set neither the SGA_TARGET nor the PGA_AGGREGATE_TARGET parameters, the database doesn t auto-tune the SGA, meaning that you must set the sizes of the individual components of the SGA However, the database auto-tunes the PGA If you set only the SGA_TARGET parameter, the database auto-tunes the subcomponents of the SGA The database always auto-tunes the PGA, regardless of whether you set the PGA_AGGREGATE_ TARGET parameter or not..

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You disable a job this way: SQL> EXEC DBMS_SCHEDULER.DISABLE('TEST_JOB1'); PL/SQL procedure successfully completed. You drop a job by using the DROP_JOB procedure, as shown here: SQL> BEGIN DBMS_SCHEDULER.DROP_JOB( JOB_NAME => 'TEST_JOB1'); END; You can run a job manually (at other than the regularly scheduled times) using the RUN_JOB procedure, as shown here: SQL> EXEC DBMS_SCHEDULER.RUN_JOB('TEST_JOB'); Finally, you can stop a job immediately using the STOP_JOB procedure, as shown here: SQL> EXEC DBMS_SCHEDULER.STOP_JOB('TEST_JOB');

In an Oracle database, the query optimizer plays a critical role in executing SQL statements in the most efficient manner. You can execute a given SQL statement in several ways, and it is the query optimizer s job to come up with the fastest and most efficient way to perform each database query.

In both the STOP_JOB and RUN_JOB procedures, you can use the FORCE attribute, which will determine Tip whether an active job can be stopped or dropped. By setting FORCE=TRUE, you can stop or drop a running job. The default for the FORCE attribute is FALSE.

To arrive at the best plan of execution for any SQL statement, the optimizer first evaluates the available access paths, join orders, and so on, and selects several candidate execution plans. Next, it computes the cost of the alternative plans, based on their use of I/O, CPU, and memory. During this step, the optimizer uses optimizer statistics crucial statistics that tell the optimizer about data distribution and storage characteristics of tables and indexes, among other things. The optimizer finally compares the costs of the alternative plans and picks the least costly plan.

A program contains metadata about what the Scheduler will run, including the name and type of the program, and what a job will execute. Different jobs can share a single program.

Oracle Database 10g introduced the automatic optimizer-statistics collection feature. You thus don t have to deal with questions about the frequency of statistics collection or the objects to include in the collection process, because Oracle will take care of all that for you.

You create a new program using the CREATE_PROGRAM procedure of the DBMS_SCHEDULER package, as shown here: SQL> BEGIN 2 DBMS_SCHEDULER.CREATE_PROGRAM( 3 PROGRAM_NAME => 'MY_PROGRAM', 4 PROGRAM_ACTION => 'UPDATE_SCHEMA_STATS', 5 PROGRAM_TYPE => 'STORED_PROCEDURE', 6 enabled => TRUE); 7* end; SQL> / PL/SQL procedure successfully completed. SQL> Once you create a program, you can simplify your job creation statement by replacing the JOB_TYPE and JOB_ACTION attributes with the name of the program that already contains the specification of these attributes. The PROGRAM_TYPE and PROGRAM_ACTION attributes thus replace the job attributes that you normally provide when creating a new job. You can see why this type of modular approach is beneficial different jobs can use the same program, thus simplifying the creation of new jobs. The following example re-creates the TEST_JOB job that was created in Listing 18-14, but using the program component this time:

There are some situations where manually collecting optimizer statistics still makes sense, and these are discussed in the Manually Collecting Optimizer Statistics section of this chapter.

SQL> BEGIN 2 DBMS_SCHEDULER.CREATE_JOB( 3 JOB_NAME => 'TEST_JOB', 4 PROGRAM_NAME => 'TEST_PROGRAM', 5 REPEAT_INTERVALl => 'FREQ=DAILY;BYHOUR=12',ENABLED => TRUE); 7* END; SQL> / PL/SQL procedure successfully completed. SQL> In the preceding example, using a program lets you avoid specifying the JOB_TYPE and JOB_ACTION parameters in the CREATE_JOB statement.

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