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When to Use Outlines
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Outlines are useful when you re planning migrations from one version of Oracle to another. The CBO could behave differently between versions, and you can cut your risk down by using stored outlines to preserve the application s present performance. You can also use them when you re upgrading your applications. Outlines ensure that the execution paths the queries used in a test instance successfully carry over to the production instance. Stored outlines are especially useful when the users of an application have information about the environment that the Oracle CBO doesn t possess. By enabling the direct editing of stored outlines, Oracle lets you tune SQL queries without changing the underlying application. This is especially useful when you re dealing with packaged applications where you can t get at the source code.
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CHAPTER 21 IMPROVING DATABASE PERFORMANCE: SQL QUERY OPTIMIZATION
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Implementing Plan Stability
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Implementing plan stability is a simple matter. You have to ensure that the following initialization parameters are consistent in all the environments. You must set the value of the first two parameters to TRUE. The default value for OPTIMIZER_FEATURES_ENABLE is 10.1.0, and if you change it, make sure it s the same in all environments. The initialization parameters are as follows: QUERY_REWRITE_ENABLED STAR_TRANSFORMATION_ENABLED OPTIMIZER_FEATURES_ENABLE
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The outlines themselves are managed through the DBMS_OUTLN and DBMS_OUTLN_EDIT Oracle packages. To create outlines for all your current SQL queries, you simply set the initialization parameter CREATE_STORED_OUTLINES to TRUE. The OUTLN user is part of the database when it is created and owns the stored outlines in the database. The outlines are stored in the table OL$. Listing 21-1 shows the structure of the OL$ table. Listing 21-1. The OL$ Table SQL> DESC OL$ Name Null Type ----------------------------------------OL_NAME VARCHAR2(30) SQL_TEXT LONG TEXTLEN NUMBER SIGNATURE RAW(16) HASH_VALUE NUMBER HASH_VALUE2 NUMBER CATEGORY VARCHAR2(30) VERSION VARCHAR2(64) CREATOR VARCHAR2(30) TIMESTAMP DATE FLAGS NUMBER HINTCOUNT NUMBER SPARE1 NUMBER SPARE2 VARCHAR2(1000) SQL> The SQL_TEXT column has the SQL statement that is outlined. In addition to the OL$ table, the user OUTLN uses the OL$HINTS and OL$NODES tables to manage stored outlines. Create a special tablespace for the user OUTLN and the tables OL$, OL$HINTS, and OL$NODES. By default, they re created in the SYSTEM tablespace. After you create a new tablespace for user OUTLN, you can use the export and import utilities to move the tables.
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Creating Outlines at the Database Level
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To let Oracle automatically create outlines for all SQL statements, use the CREATE_STORED_OUTLINES initialization parameter, as shown here: CREATE_STORED_OUTLINES = TRUE You can also dynamically enable the creation of stored outlines for the entire database by using the ALTER SYSTEM statement, as shown here:
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CHAPTER 21 IMPROVING DATABASE PERFORMANCE: SQL QUERY OPTIMIZATION
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SQL> ALTER SYSTEM SET CREATE_STORED_OUTLINES=TRUE; System altered. SQL> In both the preceding cases, the outlines that Oracle creates are assigned to a category called DEFAULT. You also have the option of specifying a named category for your stored outlines. Setting the CREATE_STORED_OUTLINES parameter means that the database creates a stored outline for every distinct SQL statement. This means that the SYSTEM tablespace could potentially run out of space if you have a large number of SQL statements that are being processed. For this reason, use the CREATE_STORED_OUTLINES initialization parameter with care. To keep the overhead low, you may instead use the option to create stored outlines at the session level, or just for a lone SQL statement, as shown in the next section.
Creating Outlines for Specific Statements
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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