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the word coupling represents a measurement of some kind between the i-th part and all the other n-1 parts in the system. In the next section, I ll introduce a mathematical symbol to represent coupling. A bit later I ll show how to measure coupling. An important job during the design phase is to reduce the overall coupling in a system to the lowest level possible. But a problem arises: How do you know when you re finished In other words, how do you know when coupling is at the lowest level possible The goal is to ensure that all complex classes and components are entirely decoupled from other components. To accomplish this, and because you know that you can t eliminate coupling completely from a system, you must find ways to shift coupling around in the system until it occurs only in desirable places. The rest of the chapter shows ways to accomplish this nontrivial goal.

The Automatic Database Diagnostic Monitor, or ADDM, is probably the most revolutionary aspect of the new self-managing Oracle database. The ADDM is a diagnostic engine built right into the database kernel it is a rule-based expert system that encapsulates decades of Oracle s performance-tuning expertise. It analyzes performance data frequently and either makes a recommendation by itself or suggests that you invoke one of the other Oracle advisory components, such as the SQL Tuning Advisor. The ADDM proactively performs automatic monitoring of the database at regular intervals throughout the day, performs a top-down analysis of performance data and bottlenecks, and presents a set of findings that include the root causes of problems and the recommendations to fix them. In addition, it provides the rationale behind its recommendations. Because the ADDM quantifies the identified problems in terms of their impact on overall performance, you can focus on fixing problems that will give you the biggest performance gains. You can also run the ADDM manually through the Enterprise Manager or the command line. The ADDM s diagnostic abilities can be used during the development phase of applications, reducing potential problems in production. The ADDM will enable developers to perform what-if tests very easily. 17 explains the ADDM in detail.

The SQL*Loader utility enables you to generate data to load columns. This means that you can do a load without ever using a datafile. More commonly, however, you generate data for one or more columns of the data when you are loading from a datafile. The following types of data can be generated by SQL*Loader: Constant value: You can set a column to a constant value by using the CONSTANT specification. For example, with the following specification, all the rows populated during this run will have the value sysadm in the loaded_by column: loaded_by CONSTANT "sysadm"

Expression value: You can set a column to the value specified by a SQL operator or a PL/SQL function. You specify the expression value using the EXPRESSION parameter, as shown here: column_name EXPRESSION "SQL string" Datafile record number: You can set a column s value to the record number that loaded that row by using the RECNUM column specification: record_num RECNUM

Coupling is a kind of dependency between two entities, but no universal symbol exists to represent coupling in software diagrams. Unified Modeling Language (UML) relies on the use of stereotypes to depict relationships. The <<uses>> dependency is often used to indicate a dependency between components, as shown in Figure 1-2.

System date: You can use the sysdate variable to set a column to the date you re loading the data: loaded_date sysdate

Sequence: You can generate unique values to load a column by using the SEQUENCE function. In the following example, the current maximum value of the loadseq sequence is incremented by one each time a row is inserted: loadseq SEQUENCE(max,1)

You can invoke the SQL*Loader utility in a number of ways. The standard syntax for invoking the SQL*Loader is as follows: SQLLDR keyword=value [,keyword=value,. . .] Here s an example showing how to invoke the SQL*Loader: $ sqlldr USERID=nicholas/nicholas1 CONTROL=/u01/app/oracle/finance/finance.ctl \ DATA=/u01/app/oracle/oradata/load/finance.dat \ LOG=/u01/aapp/oracle/finance/log/finance.log \ ERRORS=0 DIRECT=true SKIP=235550 RESUMABLE=true RESUMABLE_TIMEOUT=7200