Stratified Auto Tuning Form

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.

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Note:

This functionality is available starting with Oracle Database 11g Release 2 (11.2.0.2).

The chapter contains the following topics:

- Overview
- Security Model

Using DBMS_AUTO_SQLTUNE

Overview

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.

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

Subprogram	Description
Executes the Automatic SQL Tuning task immediately (`SYS` only)
Displays a text report of the automatic tuning task's history
Changes a task parameter value for the daily automatic runs

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

Parameter	Description
`execution_name`	A name to qualify and identify an execution. If not specified, it is generated by the advisor and returned by function.
`execution_params`	List of parameters (name, value) for the specified execution. The execution parameters have effect only on the execution for which they are specified. They override the values for the parameters stored in the task (set through the SET_AUTO_TUNING_TASK_PARAMETER Procedures).
`execution_desc`	A 256-length string describing the execution

Usage Notes

Stratified Tuning

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

Parameter	Description
`begin_exec`	Name of the beginning task execution to use. If `NULL`, the report is generated for the most recent task execution.
`end_exec`	Name of the ending task execution to use. If `NULL`, the report is generated for the most recent task execution.
`type`	Type of the report to produce. Possible values are `TEXT` which produces a text report.
`level`	Level of detail in the report: `BASIC`: simple version of the report. Just show info about the actions taken by the advisor. `TYPICAL`: show information about every statement analyzed, including requests not implemented. `ALL`: highly detailed report level, also provides annotations about statements skipped over.
`section`	Section of the report to include: `SUMMARY`: summary information `FINDINGS`: tuning findings `PLAN`: explain plans `INFORMATION`: general information `ERROR`: statements with errors `ALL`: all sections
`object_id`	Advisor framework object id that represents a single statement to restrict reporting to. `NULL` for all statements. Only valid for reports that target a single execution.
`result_limit`	Maximum number of SQL statements to show in the report

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

Stratified Performance

Parameters

Table 28-4 SET_AUTO_TUNING_TASK_PARAMETER Procedure Parameters