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As I mentioned earlier in this chapter, the CBO doesn t always use the same execution strategies. Changes in Oracle versions or changes in the initialization parameters concerning memory allocation may force the CBO to modify its plans. You can use Oracle s plan stability feature to ensure that the execution plan remains stable regardless of any changes in the database environment. The plan stability feature uses stored outlines to preserve the current execution plans, even if the statistics and optimizer mode are changed. The CBO uses the same execution plan with identical access paths each time you execute the same query. The catch is that the query must be exactly identical each time if you want Oracle to use the stored plan.

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.

PL/SQL procedure successfully completed. Let s look at another example. This time, we declare a varray of type varray_of_persons: benchmark@ORA10G> declare 2 l_varray_of_persons varray_of_persons; 3 begin We initialize the variable with three person objects, this time using a different syntax: 4 5 6 7 8 l_varray_of_persons := varray_of_persons( person( 'Joe', sysdate-23*365), person( 'John Doe', sysdate-25*365), person( 'Tim Drake', sysdate-27*365) );

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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.

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.

The next part of this example might expose a possibly surprising capability to you. In this example, we loop through the members of the varray variable l_varray_of_persons. However, we do that by running a select on the variable. Look at the select statement in the following implicit for loop carefully. The table keyword instructs the Oracle database to treat the collection as a table value that can be used in the from clause of a query. Note that we need to give this in-memory table an alias (such as the alias vp given in the following example) for the query to work. This amazing and very useful capability allows us to exploit all our SQL skills on collection variables of type varray and of type nested table (examples for nested tables follow shortly). For example, we use a where clause in the following example to filter out the contents of the varray variable: 9 10 11 12 13 14 15 16 for i in( select vp.name, vp.date_of_birth from table(l_varray_of_persons) vp where vp.name like 'J%' ) loop dbms_output.put_line( i.name || ', ' || i.date_of_birth ); end loop;

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.

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

The values of 6 and 7 in the control message operation code field (not to be confused with the values of 6 and 7 in the mode field!) relate to SNMP trap operations..

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