1. Sys_auto_sql_tuning_task Disable

Oracle 12c offers a useful utility called the SQL Tuning Advisor. You can use this built-in tool to provide suggestions or recommendations about certain SQL statements. Although it may not always give perfect advice, just like anything else, having it in your toolbox of tuning techniques is beneficial.

1. Use PL/SQL and the internal package DBMS_SQL_TUNE to create a tuning task. Type this:

   You should see the following:

   In the preceding command, note the TIME_LIMIT of 60. That limits the processing time to 60 seconds. You may not always want to run something like this for long periods in your database, because it incurs system overhead.

2. Execute the tuning advisor with your task by typing this:

   Because of the limit of 60 seconds provided in the task creation, this step may take up to 60 seconds to complete. During this time, your prompt won’t come back.

   When it completes, you should see this:

   If you’ve set a longer time and are getting impatient, you can open another SQL window to make sure that the task is still executing by typing

   You see something like the following:

3. When the execution is complete, you can view the results by running the BMS_SQLTUNE.report_tuning_task procedure. Type the following:

   For the sake of space, we’ve snipped some sections from the output that follows, but you see something like this:

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   The latter part of the report shows the before and after execution plans. In this case, you’ve seen the before when you were generating execution plans. Go ahead and add the index, regenerate the execution plan, and see whether you’ve made an improvement.

   Before you add the index, note that the recommendations give the SQL to add the index:

   Also note that Oracle gives a warning:

4. Add the index with your own name by typing this:

   You should see something like the following:

5. Take a look at the execution plan. Type the following:

   And then type

   You should see output like this:

Now that you’ve added the index, a few things are evident:

• The cost of the plan dropped from 40336 to 5.

• There are now six steps.

• The full table scan is gone. Instead you see the use of your new index.

Jan 30, 2017  A new white paper for SQL Plan Management is now available. Just go to the Query Optimization page in OTN and click the SQL Plan Management with Oracle Database link. Just like the Optimizer white paper, I've kept the content and format similar to the way Maria organized it so that it will be familiar to those of you that have read previous versions. SYSAUTOSQLTUNINGTASK is the default name of the Automatic SQL Tuning task. You can use this query DBAADVISORLOG to check the execution time of the same. You can also use Enterprise Manager to manage the features regarding Automatic SQL Tuning. BEGIN DBMSSQLTUNE.SETTUNINGTASKPARAMETER( taskname = 'SYSAUTOSQLTUNINGTASK', parameter = 'ACCEPTSQLPROFILES', value = 'TRUE'); END; / In this example, the automatic SQL tuning task is configured to automatically accept SQL profiles recommended by the SQL Tuning Advisor. ORA-13663: The task SYSAUTOSQLTUNINGTASK contains no results for execution (Doc ID 1364523.1) Last updated on FEBRUARY 14, 2019. Applies to: Enterprise Manager for Oracle Database - Version 10.2.0.1 to 11.2.0.3 Release 10.2 to 11.2. Developers and DBAs get help from Oracle experts on: SYSAUTOSQLTUNINGTASK-Is it possible if we want to gather table stats via 'SYSAUTOSQLTUNINGTASK' except some special tables. Apr 03, 2016  These messages indicate that an auto kill of a 'hung'/long running tuning task has taken place. This is a protective measure purely to avoid the task from over-running its time limit because of a single task and protects a the system from harm caused by such over-running.

Often one of the tough parts about tuning a database is having a solid understanding of the application and the data. The issue might not always be obvious. Sometimes engaging other application and data experts helps.

Explain to them your findings and what you propose. They may be able to help you come to a conclusion. Also, if the data is part of a packaged third-party application, sometimes opening a ticket with the vendor is the way to go.

Sys_auto_sql_tuning_task Disable

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