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Assume that Class1 is defined like this: public class Class1 { string whatever; public Class1() { string whatever = Class2.MyString; } } The compiler can see that the string value in Class2 is constant. When compiling Class1, the compiler might be able to embed the characters of the string whatever somewhere in the executable code of the Class1. If so, then Class1 would be K-coupled to Class2. If the compiler didn t embed the characters in the Class1 code, it might generate code to use a pointer to Class2.MyString, which would then induce unambiguous type coupling between Class1 and Class2.

are acceptable plans, however. The database defines as acceptable only those execution plans that don t lead to deterioration in performance relative to other plans in the plan history. The SQL plan baseline for a SQL statement is the set of all accepted plans in the plan history for a statement. The very first plan for a statement is always an accepted plan, because there s nothing to compare it with. So, the SQL plan baseline and the plan history for a new SQL statement are identical at this point. Newer execution plans for the statement will automatically be a part of the statement s plan history, but are added to the SQL plan baseline for the statement only if the new plans are verified not to cause a regression in performance. The Automatic SQL Tuning Adviser task, which is a part of the automate maintenance tasks, verifies SQL plans. The advisor looks for high-load SQL statements and stores the accepted plans for those statements in that s statement s SQL plan baseline. You can manage SQL plan baselines by using the DBMS_SPM package or through Enterprise Manager. I explain the steps in the following sections.

There are two ways to capture the SQL plan baselines: have the database automatically capture the plans or load them in the database yourself. I explain both techniques in this section.

By default, the database doesn t maintain a plan history for SQL statements you execute. You must set the initialization parameter OPTIMIZER_CAPTURE_SQL_PLAN_BASELINES to TRUE (the default value is FALSE) for the database to start capturing the SQL plan baselines. When you set the parameter to TRUE, the database automatically creates and maintains a plan history for all repeatable SQL statements that are executed in the database.

If type coupling can be unambiguous, it might not be too surprising to learn that it can also be ambiguous. If a class T1 contains a reference to a class T2, and T1 doesn t create any instances of T2, then T1 has ambiguous type coupling (ATC) to T2, as shown in Figure 1-15.

Tip By using the SQL Performance Analyzer (see 20), you can find out which SQL statements are likely to regress following a database upgrade to, say, Oracle Database 11g Release 1 from Oracle Database 10g Release 2. You can capture the execution plans for these statements and load them into the SQL management base of the upgraded database, thus avoiding the performance regression.

You can also load SQL plans manually into the SQL plan baselines. When you load plans manually, the database loads them automatically as accepted plans, without verifying the performance of the plans. You can bulk load SQL plans you captured before upgrading the database into a SQL plan baseline after upgrading your database to a new release. You can use either a SQL Tuning Set (STS) or load the plans from the database cursor cache. I show both techniques in the following sections. Execute the DBMS_SPM function LOAD_PLANS_FROM_SQLSET in order to load SQL plans from an STS. First create an empty STS as shown here: begin dbms_sqltune.create_sqlset( sqlset_name => 'testset1', description => 'Test STS to capture AWR Data'); end; / Next, load the new STS with SQL statements from the Automatic Workload Repository (AWR) snapshots.

Figure 1-15. Ambiguous type coupling between T1 and T2 The symbol denotes ATC, when subscripted with the letters Ta . The coupling is called ambiguous because the reference in T1 can be set to point to an instance of T2 or to a class derived from T2. The symbol Ta is equivalent to the phrase ambiguous type coupling. Figure 1-16 shows T1 using a class T3 derived from T2.