HP Integrity NonStop J-Series - Manual (Page 53)

DEVELOPING A DATA BASE
Identifying the Classes of Information
4. Listing the fields within each file
5. Selecting an appropriate file type for each file
6. Choosing key fields for each file
Identifying the Classes of Information
You can determine the appropriate classes of data for the
personnel department by considering the present flow of
information; for example:
1. When an employee is hired, the clerk performing the interview
fills out two forms:
--The first form lists the employee's name, age, and sex.
The clerk completes this form with information (such as the
employee's salary) supplied by the employee's department
manager.
--The second form contains general information about the
employee's dependents. On this form, the clerk lists each
dependent's name, age, and sex.
2. Once a month, someone from the department updates a list that
provides vacation information. This list identifies the
number of vacation days available for each employee.
3. If an employee receives a raise, a clerk retrieves the
employee's file and changes the salary information.
4. Whenever an employee informs the personnel department of a
new dependent, someone in the department must add this
information to the appropriate form.
After reviewing the current flow of information, you might
conclude that the personnel department is interested in the
classes of information shown in Figure 3-1.
3-2