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Using the DBMS_SQLTUNE Package to Run the SQL Tuning Advisor
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The main SQL package for tuning SQL statements is DBMS_SQLTUNE. The first example will be creating and managing tasks that tune SQL statements.
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You must have the ADVISOR privilege to use the DBMS_SQLTUNE package. Ensure that you do before running any of the following examples.
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Performing Automatic SQL Tuning
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Here s how to tune SQL statements using the DBMS_SQLTUNE package: 1. Create a task: The CREATE_TUNING_TASK procedure creates a task to tune a single statement or several statements (a SQL tuning set or STS). You can also use a SQL statement (using the SQL identifier) from the AWR or from the cursor cache. In the following example, I show how to create a task using a single SQL statement as input. First, I pass the SQL statement as a CLOB argument, as shown here:
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CHAPTER 19 IMPROV IN G DA TA BAS E PERFORMAN CE: SQL QUERY OPTIMIZA TION
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DECLARE my_task_name VARCHAR2(30); my_sqltext CLOB; BEGIN my_sqltext := 'SELECT /*+ ORDERED */ * FROM employees e, locations l, departments d WHERE e.department_id = d.department_id AND l.location_id = d.location_id AND e.employee_id < :bnd'; Next, I create the following tuning task: my_task_name := DBMS_SQLTUNE.CREATE_TUNING_TASK( sql_text => my_sqltext, bind_list => sql_binds(anydata.ConvertNumber(90)), user_name => 'HR', scope => 'COMPREHENSIVE', time_limit => 60, task_name => 'my_sql_tuning_task', description => 'Task to tune a query on a specified employee'); END; / In the preceding task, sql_text refers to the single SQL statement that I m tuning. The bind_list shows that 90 is the value of the bind variable bnd. The tuning task s scope is comprehensive, meaning that it analyzes the SQL Profile, and the task_limit parameter sets a limit of 60 seconds on the total time for analysis. 2. Execute the task: To execute the task, run the EXECUTE_TUNING_TASK procedure: BEGIN DBMS_SQLTUNE.EXECUTE_TUNING_TASK( task_name => 'my_sql_tuning_task' ); END; / 3. Get the tuning report: You can view the tuning process with the REPORT_TUNING_TASK procedure: SQL> SQL> SQL> SQL> SET LONG 1000 SET LONGCHUNKSIZE 1000 SET LINESIZE 100 SELECT DBMS_SQLTUNE.REPORT_TUNING_TASK( 'my_sql_tuning_task') FROM DUAL;
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The report consists of findings and recommendations. The Tuning Advisor provides the rationale and the expected benefits for each recommendation. It also provides you with the SQL to implement the recommendations. You can use the following views to manage your automatic SQL tuning efforts: DBA_ADVISOR_TASKS DBA_ADVISOR_FINDINGS DBA_ADVISOR_RECOMMENDATIONS DBA_ADVISOR_RATIONALE DBA_SQLTUNE_STATISTICS DBA_SQLTUNE_PLANS
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CHAPTER 19 IM PR OVING DA TA BAS E PERFORM ANC E: S QL QUE RY OPTIMIZA TION
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Managing SQL Profiles
Once the ATO has made its recommendations, you can accept its findings and run the DBMS_ SQLTUNE.ACCEPT_SQL_PROFILE procedure to create an appropriate SQL profile, though you must ensure you have the CREATE_ANY_PROFILE privilege first. The preceding may seem to say that a SQL profile is an inevitable consequence of an ATO process, but it will only recommend that you create a SQL profile if it has built one as a result of its scan. However, it will only do this if it collected auxiliary information while analyzing statistics and profiling SQL (as detailed previously). Oracle will apply the new profile to the SQL statement when you execute it.
Managing SQL Tuning Categories
You may find that you have a number of different SQL profiles for a single SQL statement. Oracle has to manage them in some way, so it assigns each one to a SQL tuning category. The same process occurs when a user logs in, meaning that Oracle will assign a user to a tuning category. The category is selected according to the SQLTUNE_CATEGORY initialization parameter. If you do not change it, SQLTUNE_CATEGORY takes the value DEFAULT. This means that any SQL profiles belonging to the default category apply to everyone who logs in. You can alter the SQL tuning category for every user with the ALTER SYSTEM command. You can also alter a session s tuning category with the ALTER SESSION command. For example, take the PROD and DEV categories. To change the SQL tuning category for every user, do the following: SQL> ALTER SYSTEM SET SQLTUNE_CATEGORY = PROD; If you wanted to change a session s tuning category, you could do this: SQL> ALTER SESSION SET SQLTUNE_CATEGORY = DEV;
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