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The ATO makes sure that there are representative, up-to-date statistics for all the objects in the SQL statement, which you need for efficient execution plans. If the ATO finds any statistics that are missing or stale, it suggests that you collect new statistics for the objects in question. During this process, the ATO collects other information that it can use to fill in any missing statistics. It can also correct stale statistics.

You can disable any of the three automated maintenance jobs during a specific maintenance window by executing the DISABLE procedure. SQL> 2 3 4 5 6* SQL> begin dbms_auto_task_admin.disable (client_name => 'sql tuning advisor', operation => 'automatic sql tuning task', window_name => 'monday_window'); end; /

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At this stage the ATO tries to verify the validity of its estimates of factors such as column selectivity and cardinality of database objects. It can use three methods to verify its estimates: Dynamic data sampling: The ATO can use a data sample to check its estimates. The ATO can apply correction factors if the data-sampling process shows its estimates to be significantly wrong. Partial execution: The ATO can carry out the partial execution of a SQL statement. This process allows it to check whether its estimates are close to what really happens. It does not check whether its estimates are correct, but rather it checks whether a plan derived from those statistics is the best possible plan. Past execution history statistics: The ATO can use the SQL statement s execution history to help with its work. If there s enough information from statistics analysis or SQL profiling, the ATO suggests you create a SQL profile, which is supplementary information about a SQL statement. If you accept this advice and are running the Optimizer in tuning mode, Oracle will store the SQL profile in the data dictionary. Once you have done this, the Optimizer uses it to produce optimal execution plans, even when it is running in normal mode.

PL/SQL procedure successfully completed. SQL> The example shown here disables the SQL Tuning Advisor task only during the MONDAY_ WINDOW but keeps the task enabled during all other windows.

The SQL profile will continue to apply if you make small changes to your database and allow your objects to grow normally. One of the big advantages of SQL profiles is the ability to tune packaged applications. These are hard to tune because you can t easily access and modify the code. Because SQL profiles are saved in the data dictionary, you can use them to tune packaged applications.

The Autotask Background Process (ABP) is responsible for implementing the three automated maintenance tasks by converting the tasks into Scheduler jobs. For each automated task, ABP creates a task list and assigns a priority. The three priority levels are high, medium, and urgent. The Scheduler also creates job classes and maps a consumer group to the appropriate job class. The ABP assigns jobs to each of the job classes, and the job classes map the jobs to a consumer group based on the job priority level. The MMON background process spawns restarts and monitors the ABP process. The DBA_AUTOTASK view shows the tasks stored in the ABP repository, which is in the SYSAUX tablespace. You can view the ABP repository by querying the DBA_AUTOTASK_TASK view.

The ATO analyzes how using an improved access method, such as working with an index, will affect queries. These are important considerations, because adding an index can substantially increase the speed of a query. However, adding new indexes can adversely affect other SQL statements; the SQL Advisor knows this and makes its recommendations as follows: If an index is effective, it will advise you to create it. It can advise you to run the SQL Access Advisor (see 5 for details) to analyze the wisdom of adding the new index.

The default resource plan assigned to all maintenance windows is the DEFAULT_MAINTENANCE _ PLAN. When a maintenance window opens, the database actives the DEFAULT_MAINTENANCE_PLAN to control the CPU resources used by the automated maintenance tasks. The three automated maintenance tasks are run under the ORA$AUTOTASK_SUB_PLAN, a subplan for the DEFAULT_ MAINTENANCE_PLAN. You can change the resource allocation for automated tasks by changing the resource allocations for this subplan in the resource plan for a specific maintenance window.

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