Database Reference
In-Depth Information
CHAPTER 6
OBJECT-BASED DATA MODEL:
PRINCIPLES AND COMPONENTS
CHAPTER OBJECTIVES
•
Understand the essentials of the object-based modeling method
•
Examine and study each component of the data model
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Discuss special types of object sets represented in the data model
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Explore relationships among object sets in detail
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Study means for creating an object-based data model
Before proceeding further, let us recapitulate what we have covered so far on data
modeling so that you can grasp the significance and place of the object-based data
model in logical design. By now, you understand clearly that a data model is a rep-
resentation or replica of the portion of real-world information that is relevant to
the organization. We reviewed the concept of data views. These are user views of
data to be present in the proposed database. All data views, merged and aggregated,
form the basis for the data model.
We also discussed different levels of the data model. The semantic data model,
capturing the true meaning of real-world information and created from the inte-
gration of user views, is said to be at the highest level of integration. Two techniques
are generally employed to create a semantic data model: the object-based data
modeling technique and the entity-relationship data modeling technique. These
techniques are equally effective.
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