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A table is said to be in 1NF if it doesn t contain any repeating groups; that is, no column should have multiple values for any given row. This definition, of course, implies that a non-normalized table contains one or more repeating groups. A repeating group occurs when there are multiple values for a single occurrence of an attribute in a table. To summarize, a table (relation) is in 1NF if 1. There are no duplicated rows in the table. 2. Each cell is single-valued (that is, there are no repeating groups or arrays). 3. Entries in a column (attribute, field) are of the same kind.

Although the system uses a Builder and Binder, those two classes don t appear in the wiring diagram, because they don t participate in the ordinary operation of the system. They set up the various parts, wire them together, and then step out of the picture. Since the Builder and Binder work directly with all the top-level classes in the system, they are also at the center of the system s coupling diagram, shown in Figure 11-8.

The order of the rows and columns doesn t matter. The requirement that there be no duplicated rows in the table means that the table has a key (on one column or a combination of columns).

Thus, to put your tables in 1NF, you must first eliminate repeating groups, which can generally be identified by multiple values being stored at the intersection of a row and column. For example, if an employee has several skills, you might have to specify multiple values in the Skill ID column for

that employee. Or you may be using several rows for the same employee, one for each skill. Neither is an attractive option. The way to simplify this table into a 1NF table is to break it down so there are only single, atomic values for each attribute or column. Create a separate table for each set of related attributes, and give each table a primary key. In our example, moving the skills attribute into a separate table helps considerably. Separating the repeating groups of skills from the employee data results in two tables in first normal form. The Employee Number in the Skills table matches the primary key in the Employees table, providing a foreign key for relating the two tables with a join operation (see Tables 2-2 and 2-3).

Figure 11-8. The coupling diagram on the main parts of the system The star pattern tells you that the system coupling is ideal: One class is coupled to all the others, and the classes in the periphery are decoupled from each other. The diagram only shows the Builder at the center. The Binder is also at the center, but I omitted it to keep the diagram easier to read.

Table 2-2. Employees Table in First Normal Form Employee Number Employee Name Department Name Department Location

To enable the automatic management of your undo space, you first need to specify the automatic undo mode in the init.ora file or your SPFILE. By default, the database uses AUM in Oracle Database 11g. Second, you need to create a dedicated tablespace to hold the undo information. This will guarantee that you don t end up storing the undo information in the System tablespace, which isn t a great idea. You also must choose an interval for undo retention. If you want to choose AUM when you create a new database, you need to configure the following three initialization parameters: undo_management undo_tablespace undo_retention

You specify AUM in your initialization parameter file by adding the following line: UNDO_MANAGEMENT = auto The default for undo management in Oracle Database 11g is automatic, which means you can leave out the UNDO_MANAGEMENT initialization parameter if you want.

From the life-cycle perspective, SystemBrowser is like many systems because it has three modes of operation: startup, cruise, and shutdown. In the startup state, it displays a splash screen with a progress bar while the system is initialized. The splash screen is shown in Figure 11-9.

Use the Database Resource Manager to set up undo quotas for groups of users called consumer resource groups, if you think any users are monopolizing undo tablespace usage.