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When you use stored outlines to preserve a currently efficient execution plan, you re limiting Oracle s capability to modify its execution plans dynamically based on changes to the database environment and changes to the statistics. Ensure you use this feature for valid purposes, such as maintaining similar plans for distributed applications.
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On the face of it, the stored outline feature doesn t seem impressive. Let s consider a simple example to see how a stored outline could be useful in a real production environment. Suppose you have a system that s running satisfactorily and, due to a special need, you add an index to a table. The addition of the new index could unwittingly modify the execution plans of the CBO, and your previously fast-running SQL queries may slow down. It could conceivably take a lot of effort, testing, and time to fix the problem by changing the original query. However, if you had created stored outlines, these kinds of problems wouldn t arise. Once Oracle creates an outline, it stores it until you remove it. In the next section you ll examine how to implement planned stability in a database.
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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.
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CHAPTER 19 IMPROV IN G DA TA BAS E PERFORMAN CE: SQL QUERY OPTIMIZA TION
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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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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 11.1.0.6, and if you change it, make sure it s the same in all environments. Here are the relevant initialization parameters: 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$. Listing 19-1 shows the structure of the OL$ table. Listing 19-1. The OL$ Table SQL> DESC OL$ Name -----------OL_NAME SQL_TEXT TEXTLEN SIGNATURE HASH_VALUE HASH_VALUE2 CATEGORY VERSION CREATOR TIMESTAMP FLAGS HINTCOUNT SPARE1 SPARE2 SQL> Null ----Type -----------VARCHAR2(30) LONG NUMBER RAW(16) NUMBER NUMBER VARCHAR2(30) VARCHAR2(64) VARCHAR2(30) DATE NUMBER NUMBER NUMBER VARCHAR2(1000)
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.
CHAPTER 19 IM PR OVING DA TA BAS E PERFORM ANC E: S QL QUE RY OPTIMIZA TION
Creating Outlines at the Database Level
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: 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.
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