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You can create outlines for a specific statement or a set of statements by using the ALTER SESSION statement, as shown here: SQL> ALTER SESSION SET create_stored_outlines = true; Session altered. SQL> Any statements you issue after the ALTER SESSION statement is processed will have outlines stored for them. To create a stored outline for a specific SQL statement, you use the CREATE OUTLINE statement. The user issuing this command must have the CREATE OUTLINE privilege. The following statement shows how to create a simple outline for a SELECT operation on the employees table: SQL> CREATE OUTLINE test_outline 2 ON SELECT employee_id, last_name 3 FROM hr.employees; Outline created. SQL> You can use the DROP OUTLINE statement to drop an outline, as shown here: SQL> DROP OUTLINE test_outline; Outline dropped. SQL>
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After you create the stored outlines, Oracle won t automatically start using them. You have to use the ALTER SESSION or ALTER SYSTEM statement to set USE_STORED_OUTLINES to TRUE. The following example uses the ALTER SYSTEM statement to enable the use of the stored outlines at the database level:
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CHAPTER 19 IMPROV IN G DA TA BAS E PERFORMAN CE: SQL QUERY OPTIMIZA TION
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SQL> ALTER SYSTEM SET use_stored_outlines=true; System altered. SQL> You can also set the initialization parameter USE_STORED_OUTLINES to TRUE, to enable the use of the stored outlines. Otherwise, the database won t use any stored outlines it has created.
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You can easily change the stored access paths while using the plan stability feature. You can use either the DBMS_OUTLN_EDIT package or OEM to perform the changes.
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Changes such as database upgrades, or even minor changes such as adding or deleting an index, could affect SQL execution plans. I explained the Oracle stored outlines feature earlier in this chapter as a way to preserve SQL execution plans to prevent performance deterioration when the database undergoes major changes such as a database upgrade. Oracle recommends that you use the new feature called SQL Plan Management (SPM) to keep performance from being affected by major system changes. SQL Plan Management preserves database performance under the following types of system changes: Database upgrades New optimizer version Changes in optimizer parameters Changes in system settings Changes in schema and metadata definitions Deployment of new application modules Although you can tune SQL statements using the SQL Tuning Advisor and ADDM, that s at best a reactive mechanism and requires the DBA to intervene. SPM is designed as a preventative mechanism. The database controls the evolution of SQL plans using the new SQL plan baselines, which are sets of efficient execution plans captured by the database over a period of time. The database allows a new execution plan to become part of a SQL plan baseline for a statement only if the new plan doesn t cause a regression in performance. The database uses only those execution plans that are part of a SQL plan baseline to execute SQL statements, and thus the database achieves the key goal of preserving database performance in the face of major system changes such as database upgrades. The SPM comes in very handy when you re upgrading to Oracle Database 11g. After you upgrade to Oracle Database 11g from, say, the Oracle Database 10g release, first leave the OPTIMIZER_FEATURES_ ENABLE parameter at 10.2. Once the SPM mechanism collects the execution plans and stores them as SQL plan baselines, you can switch to the 11.1 setting for the OPTIMIZER_FEATURES_ENABLE parameter. This way, you ensure that you re using all the new capabilities of the 11g release, without compromising SQL performance: performance is safeguarded through the use of SQL plan baselines, which are similar in this regard to the stored outlines maintained by the database.
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