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Testing the Recommendations for New SQL Profiles
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For any SQL profile recommendation it makes, the SQL Tuning Advisor runs the statement with and without the profile and compares the performance. The advisor will recommend adopting a profile only if implementing the profile leads to at least a threefold increase in improvement in performance, as shown by a reduction in the sum of the CPU and I/O usage.
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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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Implementing the SQL Profiles
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The setting of the ACCEPT_SQL_PROFILES attribute of the SET_TUNING_TASK_PARAMETERS view determines whether the database automatically accepts the SQL profile recommendations made by the Automatic SQL Tuning Advisor. The DBA_SQL_PROFILES view shows all the automatically implemented SQL profiles. If a SQL profile was automatically implemented, it ll have a value of AUTO in the TYPE column.
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You can t tune the following types of statements with the Automatic SQL Tuning Advisor: Parallel queries Ad hoc queries Recursive statements SQL statements that use the INSERT and DELETE statements SQL statements that use DDL statements such as CREATE TABLE AS SELECT If a query takes a long time to execute after implementing a SQL profile, the advisor will reject the implementation of the SQL profile, since it can t test-execute the query. Note that with the exception of ad hoc statements, you can manually tune all the preceding types of statements with a manual invocation of the SQL Tuning Advisor.
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Configuring Automatic SQL Tuning
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Use the DBMS_SQLTUNE package to configure and manage the automatic SQL tuning task. Manage the SYS_AUTO_TUNING_TASK, which controls the automatic SQL tuning job, with the following procedures: SET_TUNING_TASK_PARAMETERS: Use this procedure to test task parameters controlling items such as whether to automatically implement SQL profiles. EXECUTE_TUNING_TASK: Use this procedure to run the tuning task in the foreground. EXPORT_TUNING_TASK: This procedure helps produce a task execution report. The Automatic SQL Tuning Advisor job runs for a maximum of one hour by default, but you can change the execution time limit by executing the SET_TUNING_TASK_PARAMETERS procedure, as shown here: SQL> exec dbms_sqltune.set_tuning_task_parameter ('SYS_AUTO _SQL_TUNING_TASK', 'TIME_LIMIT', 14400); The previous example shows how to raise the maximum run time for the SQL tuning task to four hours, from its default value of one hour. The SET_TUNING_TASK_PARAMETERS procedure enables you to configure the tuning task by specifying the following parameters: ACCEPT_SQL_PROFILES determines whether the database must automatically accept a SQL profile. REPLACE_USER_SQL_PROFILES determines whether the task should replace the SQL profiles created by the user. MAX_SQL_PROFILES_PER_EXEC specifies the maximum number of SQL profiles that can be accepted for a single automatic SQL tuning task.
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CHAPTER 19 IMPROV IN G DA TA BAS E PERFORMAN CE: SQL QUERY OPTIMIZA TION
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MAX_AUTO_SQL_PROFILES determines the total number of SQL profiles that are accepted by the database. EXECUTION_DAYS_TO_EXPIRE specifies the maximum number of days for which the database saves the task history. The default is 30 days. The following example shows how to configure a SQL tuning task that ll automatically accept all SQL profile recommendations: SQL> 2 3 4 5* begi dbms_sqltune.set_tuning_task_parameters( task_name => 'SYS_AUTO_SQL_TUNING_PROG', parameter => 'accept_sql_profiles', value => 'true'); end;
SQL> / The previous example sets the value for the ACCEPT_SQL_PROFILES parameter to TRUE, which makes the advisor automatically accept SQL profile recommendations. The SYS_AUTO_SQL_TUNING_TASK procedure runs the automatic SQL tuning job every night during the maintenance window of the Oracle Scheduler. It tunes SQL statements according to the priority ranking in the SQL candidates. It creates necessary SQL profiles for a statement and tests them before tuning the next statement in the candidate list.
Managing Automatic SQL Tuning
Use the DBMS_AUTO_TASK_ADMIN package to enable and disable the Automatic SQL Tuning Advisor job during the Scheduler maintenance window. The ENABLE procedure helps you enable the Automatic SQL Tuning Advisor task: begin dbms_auto_task_admin.enable ( client_name => 'sql tuning advisor', operation => 'NULL', window_name='NULL'); end; The value NULL for the WINDOW_NAME parameter will enable the task in all maintenance windows. To specify the task in a specific maintenance window, specify a window name, as shown here: begin dbms_auto_task_admin.enable ( client_name => 'sql tuning advisor', operation => 'NULL', window_name='monday_night_window'); end; To disable the Automatic SQL Tuning Advisor task, execute the DISABLE procedure, as shown here: begin dbms_auto_task_admin.disable ( client_name => 'sql tuning advisor', operation => 'NULL', window_name='NULL'); end;
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