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Figure 1-35. The coupling diagram if C1 calls B2 through a separate interface This diagram is an improvement over the previous one, because it adds coupling between C1 and an interface, but you could package this interface in a separate component containing all the user-defined types in the system. Perhaps C1 and B2 are already coupled to this component, so no additional intercomponent coupling is added to the system with the addition of Interface1. I ll discuss user-defined types and their packaging in detail a bit later in the chapter.

Here are the key steps in the database-creation log shown in Listing 10-6: The database mounted statement means that Oracle has opened the control files you specified in the init.ora file. The successful open of redo thread 1 statement indicates that the first redo log file has successfully been created and opened for recovery purposes. The Sysaux and System tablespaces are successfully created. The rollback segment named system is created in the System tablespace. The undo tablespace, UNDOTBS, is successfully created. The TEMP01 tablespace is created as a temporary tablespace, using a temp file instead of the regular datafiles used for permanent tablespaces. After the temporary tablespace is created, the ALTER DATABASE DEFAULT TEMPORARY TABLESPACE TEMP01 statement is executed to designate TEMP01 as the default temporary tablespace for this database. The USERS tablespace is created and the ALTER DATABASE DEFAULT TABLESPACE USERS statement is executed to designate the USERS tablespace as the default permanent tablespace for the new database. The new background processes, QMNC and MMNL, are started.

When you create the flash recovery area, which is a specialized location for storing recovery-related files, you can t use the traditional LOG_ARCHIVE_DEST and LOG_ARCHIVE_DUPLEX_DEST parameters. You must instead specify the LOG_ARCHIVE_DEST_n parameter.

You can use event notifications to avoid adding new type coupling between C1 and B2. C1 has to fire an event that you can route to B2. You have to make C2 expose a new event that fires when B2.DoThis needs to be called. During the initialization of the system, you must wire C1 s event notification to B2. You must change C1 somewhat, but no changes to B2 are necessary, and no coupling needs to be added between C1 and B2. I ll discuss events, event firing, and event notification wiring in later chapters.

Oracle provides two important scripts, catalog.sql and catproc.sql, that you need to run right after you create your new database: catalog.sql populates the database with the data dictionary views, public synonyms, and other objects. The data dictionary base tables, the parents of the V$ views, are the first objects created in the Oracle database. catproc.sql creates the Oracle-provided packages and other objects to support the use of PL/ SQL code in the database. When you run these scripts, you ll see a lot of information flow past on the screen, indicating that the necessary database objects are being created, and so on. Just let the two scripts do what they are supposed to do. It should take about an hour or so to run both scripts.

Ignore any errors that you see during the execution of the catalog.sql and catproc.sql scripts. These errors mostly state that the object that is to be dropped doesn t exist. If it bothers you to see all those errors, you can reassure yourself by running each script twice. You won t see any errors during the second execution if you do this.

Connect as the SYS user with SYSDBA privileges, and run the scripts as follows: SQL> @$ORACLE_HOME/rdbms/admin/catalog.sql . . . Grant succeeded PL/SQL procedure successfully completed. SQL> SQL> @$ORACLE_HOME/rdbms/admin/catproc.sql . . . PL/SQL procedure successfully completed. SQL>

The dimensions of coupling space are all linearly independent, but it is nonetheless possible to convert one coupling flavor into another using a coupling transform Mathematically, a coupling transform is a function that maps a point P0 in coupling space to a new point P1 Coupling transforms allow you to convert undesirable flavors of coupling into more tolerable flavors You can never eliminate coupling completely from an entire system, so a coupling transform typically reduces coupling in one dimension at the expense of coupling in one or more other dimensions Using transforms, it becomes possible to alter the design of a system and reduce the coupling between its classes and components, assuming you have access to the source code You could build the coupling transforms described in this chapter into a tool that applies the transforms in an automated way.