85 DBMS_OUTLN

The DBMS_OUTLN package, synonymous with OUTLN_PKG, contains the functional interface for subprograms associated with the management of stored outlines.

See Also:

For more information about using the DBMS_OUTLN package, see "Using Plan Stability" in Oracle Database Performance Tuning Guide.

Note:

Stored outlines will be desupported in a future release in favor of SQL plan management. In Oracle Database 11g Release 1 (11.1), stored outlines continue to function as in past releases. However, Oracle strongly recommends that you use SQL plan management for new applications. SQL plan management creates SQL plan baselines, which offer superior SQL performance and stability compared with stored outlines.If you have existing existing stored outlines, please consider migrating them to SQL plan baselines by using the LOAD_PLANS_FROM_CURSOR_CACHE Functions or LOAD_PLANS_FROM_SQLSET Function of the DBMS_SPM package. When the migration is complete, you should disable or remove the stored outlines.

This chapter contains the following topics:


Using DBMS_OUTLN


Overview

A stored outline is the stored data that pertains to an execution plan for a given SQL statement. It enables the optimizer to repeatedly re-create execution plans that are equivalent to the plan originally generated along with the outline.The data stored in an outline consists, in part, of a set of hints that are used to achieve plan stability.

Stored outlines will be de-supported in a future release in favor of SQL plan management. As of 11g R1, stored outlines continue to function as in past releases, but Oracle strongly recommends that you use SQL plan management for new applications. SQL plan management creates SQL plan baselines, which offer superior SQL performance and stability compared with stored outlines.If you have existing stored outlines, please consider migrating them to SQL plan baselines by using the LOAD_PLANS_FROM_CURSOR_CACHE Functions or the LOAD_PLANS_FROM_SQLSET Function of the DBMS_SPM package. When the migration is complete, you should disable or remove the stored outlines.


Security Model

DBMS_OUTLN contains management procedures that should be available to appropriate users only. EXECUTE privilege is not extended to the general user community unless the DBA explicitly does so.

PL/SQL functions that are available for outline management purposes can be executed only by users with EXECUTE privilege on the procedure (or package).


Summary of DBMS_OUTLN Subprograms

Table 85-1 DBMS_OUTLN Package Subprograms

Subprogram Description

CLEAR_USED Procedure

Clears the outline 'used' flag

CREATE_OUTLINE Procedure

Generates outlines from the shared cursor identified by hash value and child number

DROP_BY_CAT Procedure

Drops outlines that belong to a specified category

DROP_UNUSED Procedure

Drops outlines that have never been applied in the compilation of a SQL statement

EXACT_TEXT_SIGNATURES Procedure

Updates outline signatures to those that compute based on exact text matching

UPDATE_BY_CAT Procedure

Changes the category of outlines in one category to a new category

UPDATE_SIGNATURES Procedure

Updates outline signatures to the current version's signature



CLEAR_USED Procedure

This procedure clears the outline 'used' flag.

Syntax

DBMS_OUTLN.CLEAR_USED (
   name    IN    VARCHAR2);

Parameters

Table 85-2 CLEAR_USED Procedure Parameters

Parameter Description

name

Name of the outline.



CREATE_OUTLINE Procedure

This procedure generates an outline from the shared cursor identified by hash value and child number.

Syntax

DBMS_OUTLN.CREATE_OUTLINE (
   hash_value    IN NUMBER,
   child_number  IN NUMBER,
   category      IN VARCHAR2 DEFAULT 'DEFAULT');

Parameters

Table 85-3 CREATE_OUTLINE Procedure Parameters

Parameter Description

hash_value

Hash value identifying the target shared cursor.

child_number

Child number of the target shared cursor.

category

Category in which to create outline (optional).



DROP_BY_CAT Procedure

This procedure drops outlines that belong to a particular category. While outlines are put into the DEFAULT category unless otherwise specified, users have the option of grouping their outlines into groups called categories.

Syntax

DBMS_OUTLN.DROP_BY_CAT (
   cat VARCHAR2);

Parameters

Table 85-4 DROP_BY_CAT Procedure Parameters

Parameter Description

cat

Category of outlines to drop.


Usage Notes

This procedure purges a category of outlines in a single call.

Examples

This example drops all outlines in the DEFAULT category:

DBMS_OUTLN.DROP_BY_CAT('DEFAULT'); 

DROP_UNUSED Procedure

This procedure drops outlines that have never been applied in the compilation of a SQL statement.

Syntax

DBMS_OUTLN.DROP_UNUSED;

Usage Notes

You can use DROP_UNUSED for outlines generated by an application for one-time use SQL statements created as a result of dynamic SQL. These outlines are never used and take up valuable disk space.


EXACT_TEXT_SIGNATURES Procedure

This procedure updates outline signatures to those that compute based on exact text matching.

Syntax

DBMS.OUTLN.EXACT_TEXT_SIGNATURES;

Usage Notes

This procedure is relevant only for downgrading an outline to 8.1.6 or earlier.


UPDATE_BY_CAT Procedure

This procedure changes the category of all outlines in one category to a new category.

Syntax

DBMS.OUTLN.UPDATE_BY_CAT (
   oldcat    VARCHAR2 default 'DEFAULT',
   newcat    VARCHAR2 default 'DEFAULT');

Parameters

Table 85-5 UPDATE_BY_CAT Procedure Parameters

Parameter Description

oldcat

The current category of outlines.

newcat

The new category of outlines.



UPDATE_SIGNATURES Procedure

This procedure updates outline signatures to the current version's signature.

Syntax


DBMS.OUTLN.UPDATE_SIGNATURES;

Usage Notes

You should execute this procedure if you have imported outlines generated in an earlier release to ensure that the signatures are compatible with the current release's computation algorithm.