Chapter 12: Problem 4

Why is it important to use an implementation-independent data model during conceptual schema design? What models are used in current design tools? Why?

Short Answer

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Implementation-independent data models are crucial during conceptual schema design to prioritize logical data structure and relationships, enhancing the process's clarity and flexibility. Current design tools primarily use Entity-Relationship (E-R) models and Unified Modeling Language (UML) diagrams due to their utility in visualizing data structure, processes, and systems' architectural blueprints.

Step by step solution

Define Implementation-Independent Data Model

An implementation-independent data model is a manner of describing data where details about how the data is stored or implemented are excluded. These types of models focus on capturing different types of data and relationships between data, rather than considering technical aspects like data storage strategies or technologies.

Explain the Importance of Implementation-Independent Data Models

Using implementation-independent data models in conceptual schema design is essential because it allows us to emphasize the data's logical structure and relationships. It enhances clarity, enabling non-technical stakeholders to understand and participate in the design process. Moreover, it adds flexibility, as it doesn't tie the data design to a particular implementation or technology, enabling changes in the future without significant revamps of the schema.

Identify Models Used in Current Design Tools

The two main types of data models used in current design tools are Entity-Relationship (E-R) models and Unified Modeling Language (UML) diagrams.

Elucidate Why They Are Used

Entity-Relationship (E-R) models are commonly used because they provide a clear visual representation of the data and its associated relationships. This makes it easier for both technical and non-technical individuals to comprehend the data structure. On the other hand, Unified Modeling Language (UML) diagrams are used because they offer a standard way to visualize a system's architectural blueprints, including elements such as activities, actors, business processes, database schemas, components, programming language statements, and reusable software components.

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Why is it important to use an implementation-independent data model during conceptual schema design? What models are used in current design tools? Why?

Short Answer

Step by step solution

Define Implementation-Independent Data Model

Explain the Importance of Implementation-Independent Data Models

Identify Models Used in Current Design Tools

Elucidate Why They Are Used

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