The
DBMS_AUTO_SQLTUNE package is the interface for managing the Automatic SQL Tuning task. Unlike DBMS_SQLTUNE , the DBMS_AUTO_SQLTUNE package requires the DBA role.
The dbmssqltune package also provides a PL/SQL API to work with SQL Tuning Sets (STS). The STS is a database object that contains one or more SQL statements combined with their execution statistics and context such as particular schema, application module name, list of bind variables, etc. 基本はOracle Enterprise Managerを使用しますが、ここではDBMSSQLTUNEパッケージでの実行について説明します。 SQLチューニング・アドバイザの実行は、以下のようにSQLチューニング・アドバイザ・タスクの作成と実行が必要になります。.
Note:
This functionality is available starting with Oracle Database 11g Release 2 (11.2.0.2).
Mar 13, 2017 Do you know if you SYSAUTOSQLTUNINGTASK sql ran frequently in your 11g OEM? It is possible that dbaadvisorparameters.ACCEPTSQLPROFILES was disabled on your 11g, which means that Automatic SQL Tuning didn't run. Aug 31, 2015 ORA-06512: at 'SYS.DBMSSQLTUNE', line 702 ORA-06512: at line 4 I found the below Program named as 'AUTOSQLTUNNINGPROG' is running the below sql job which failed.
The chapter contains the following topics:
Using DBMS_AUTO_SQLTUNEOverview
The
DBMS_AUTO_SQLTUNE package is the interface to SQL Tuning Advisor (DBMS_SQLTUNE ) when run within the Autotask framework. The database creates the automated system task SYS_AUTO_SQL_TUNING_TASK as part of the catalog scripts. This task automatically chooses a set of high-load SQL from AWR and runs the SQL Tuning Advisor on this SQL. The automated task performs the same comprehensive analysis as any other SQL Tuning task.
The automated task tests any SQL profiles it finds by executing both the old and new query plans. Automatic SQL Tuning differs from manual SQL tuning in one important way. If automatic implementation of SQL profiles is enabled (the default is disabled), then the database implements any SQL profiles that promise a great performance benefit. The implementation occurs at tuning time so that the database can immediately benefit from the new plan. You can enable or disable automatic implementation by using the
SET_AUTO_TUNING_TASK_PARAMETER API to set the ACCEPT_SQL_PROFILES parameter.
In each maintenance window, the automated tuning task stores its results as a new execution. Each execution result has the same task name but a different execution name. Query the
DBA_ADVISOR_EXECUTIONS view for information about task executions. Use the REPORT_AUTO_TUNING_TASK Function to view reports that span multiple executions.
Security Model
This package is available to users with the
DBA role. For other users, you must grant the EXECUTE Boot camp assistant mac crashes. privilege on the package explicitly. Note that the EXECUTE_AUTO_TUNING_TASK procedure is an exception: only SYS can invoke it.
Users can call APIs in this package to control how the automatic tuning task behaves when it runs, such as enabling automatic SQL profile creation and configuring the total and per-SQL time limits under which the task runs. Because these settings affect the overall performance of the database, it may not be appropriate for all users with the
ADVISOR privilege to have access to this package.
Summary of DBMS_AUTO_SQLTUNE Subprograms
Table 28-1 DBMS_AUTO_SQLTUNE Package Subprograms
EXECUTE_AUTO_TUNING_TASK Function & Procedure
This function and procedure executes the Automatic SQL Tuning task (
SYS_AUTO_SQL_TUNING_TASK ). Both the function and the procedure run in the context of a new task execution. The difference is that the function returns that new execution name. Note that only SYS can invoke this subprogram.
Syntax
Parameters
Table 28-2 EXECUTE_TUNING_TASK Function & Procedure Parameters
Usage Notes
A tuning task can be executed multiple times without having to reset it.
Examples
REPORT_AUTO_TUNING_TASK Function
This procedure displays the results of an Automatic SQL Tuning task.
Syntax
Parameters
Table 28-3 REPORT_TUNING_TASK Function Parameters
Return Values
A
CLOB containing the desired report.
Examples
SET_AUTO_TUNING_TASK_PARAMETER Procedures
This procedure updates the value of a SQL tuning parameter of type
VARCHAR2 or NUMBER as used for the reserved auto tuning task, SYS_AUTO_SQL_TUNING_TASK .
Syntax
Parameters
Table 28-4 SET_AUTO_TUNING_TASK_PARAMETER Procedure Parameters
Note:
This functionality is available starting with Oracle Database 11g Release 2 (11.2.0.2).
The chapter contains the following topics:
Using DBMS_AUTO_SQLTUNEOverview
The
DBMS_AUTO_SQLTUNE package is the interface to SQL Tuning Advisor (DBMS_SQLTUNE ) when run within the Autotask framework. The database creates the automated system task SYS_AUTO_SQL_TUNING_TASK as part of the catalog scripts. This task automatically chooses a set of high-load SQL from AWR and runs the SQL Tuning Advisor on this SQL. The automated task performs the same comprehensive analysis as any other SQL Tuning task.
The automated task tests any SQL profiles it finds by executing both the old and new query plans. Automatic SQL Tuning differs from manual SQL tuning in one important way. If automatic implementation of SQL profiles is enabled (the default is disabled), then the database implements any SQL profiles that promise a great performance benefit. The implementation occurs at tuning time so that the database can immediately benefit from the new plan. You can enable or disable automatic implementation by using the
SET_AUTO_TUNING_TASK_PARAMETER API to set the ACCEPT_SQL_PROFILES parameter.
In each maintenance window, the automated tuning task stores its results as a new execution. Each execution result has the same task name but a different execution name. Query the
DBA_ADVISOR_EXECUTIONS view for information about task executions. Use the REPORT_AUTO_TUNING_TASK Function to view reports that span multiple executions.
Security Model
This package is available to users with the
DBA role. For other users, you must grant the EXECUTE privilege on the package explicitly. Note that the EXECUTE_AUTO_TUNING_TASK procedure is an exception: only SYS can invoke it.
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Users can call APIs in this package to control how the automatic tuning task behaves when it runs, such as enabling automatic SQL profile creation and configuring the total and per-SQL time limits under which the task runs. Because these settings affect the overall performance of the database, it may not be appropriate for all users with the
ADVISOR privilege to have access to this package.
Summary of DBMS_AUTO_SQLTUNE SubprogramsDbms_sqltune.execute_tuning_task( 'sys_auto_sql_tuning_task')
Table 28-1 DBMS_AUTO_SQLTUNE Package Subprograms
EXECUTE_AUTO_TUNING_TASK Function & Procedure
This function and procedure executes the Automatic SQL Tuning task (
SYS_AUTO_SQL_TUNING_TASK ). Both the function and the procedure run in the context of a new task execution. The difference is that the function returns that new execution name. Note that only SYS can invoke this subprogram.
Parameters
Table 28-2 EXECUTE_TUNING_TASK Function & Procedure Parameters
Usage Notes
A tuning task can be executed multiple times without having to reset it.
REPORT_AUTO_TUNING_TASK Function
This procedure displays the results of an Automatic SQL Tuning task.
Parameters
Table 28-3 REPORT_TUNING_TASK Function Parameters
Return Values
Oracle Dbms_sqltune.report_tuning_task
A
CLOB containing the desired report.
SET_AUTO_TUNING_TASK_PARAMETER Procedures
This procedure updates the value of a SQL tuning parameter of type
VARCHAR2 or NUMBER as used for the reserved auto tuning task, SYS_AUTO_SQL_TUNING_TASK .
Dbms_sqltune.execute_tuning_task 12c
Parameters
Table 28-4 SET_AUTO_TUNING_TASK_PARAMETER Procedure Parameters
Exec Dbms_sqltune.execute_tuning_task('sys_auto_sql_tuning_task')
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