Entity clustering definition: Is an entity cluster a set of one or more entity types along with their associated relationships, grouped to simplify an ERD view?

Introduction / Context:
Large ERDs quickly become difficult to read. To improve comprehension, modelers use “entity clusters,” which aggregate related entities and their relationships into a single visual unit on a diagram. This question checks the correct definition of an entity cluster.

Given Data / Assumptions:

• An ERD view contains many entities and relationships.
• We want a diagramming abstraction that hides detail while preserving conceptual connections.
• Clustering is about presentation on a view, not about altering the underlying logical model.

Concept / Approach:
An entity cluster is precisely a set of one or more entity types and their relationships grouped for readability. It does not change keys, cardinalities, or normalization; it merely replaces a group of boxes and lines with a single cluster icon on that view. Analysts can drill into the cluster to see the underlying detailed entities when needed.

Step-by-Step Solution:

Verification / Alternative check:
Compare the diagram before and after clustering; the number of shapes is reduced, but the underlying repository still lists all original entities and relationships unchanged.

Why Other Options Are Wrong:

• “Incorrect” misrepresents the textbook definition.
• Tying clustering to physical diagrams or to subtyping is unnecessary; it is a general diagramming technique applicable to many scenarios.

Common Pitfalls:
Misusing clusters as a replacement for proper normalization, or hiding critical relationships that stakeholders need to review. Ensure clusters are used to enhance, not obscure, understanding.

Final Answer:
Correct