Database Reference
In-Depth Information
REALITY
ACTUAL
INFORMATION
INCLUDES
NUMEROUS DETAILS
DATA MODEL
REPRESENTATION
OF
ONLY RELEVANT,
SELECTED DETAILS
Figure 5-6
Filtering out of irrelevant data.
existing documents. While performing these tasks, automatically only the relevant
data are indicated as information requirements.
Mapping of Components
Once you have filtered out the irrelevant information, how do you proceed to create
the right data model? After you complete the filtering process, you are left with only
the objects and only the relevant elements of data about each object to be included
in the data model. You have noted that a data model is built with suitable building
blocks or components. These components or building blocks must represent each
and every element of the selected information requirements. So the next step
for creating the correct data model is to map the information requirements to
individual building blocks of the model.
Go back to the model to be built for emergency services billing. In this context,
also review the data model components indicated in Figure 5-4. The information
content for emergency services billing must be mapped to such components. Figure
5-7 shows how the mapping is done. Note each element of information requirements
and the corresponding component of the data model.
Data Model to Data Design
Requirements definition, filtering out of irrelevant details, creating the data model—
these are the steps up to the data model. The data model you have created with
some standard building blocks is now ready for the next step in the development
process. The data model truly represents the information content of the proposed
database. How do you get to database implementation from the data model?
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