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Database Modelling Fundamentals

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Questions and Answers

What is the primary focus of analysts when creating a logical data model?

Matching the model to real business requirements

During which phase of database design is a physical data model created?

Design phase

What is the purpose of constraints in a data model?

To ensure data integrity

What is the role of attributes in a data model?

Characteristics of entities, equivalent to fields in file systems Signup and view all the answers

Why are business rules essential in data modeling?

To provide precise descriptions of policies or procedures within an organization Signup and view all the answers

What are the basic building blocks of all data models?

Entities, attributes, relationships, and constraints Signup and view all the answers

What are the key components of a table in a Physical Data Model?

Well-defined columns, keys, indexes, and triggers as needed. Signup and view all the answers

What is the primary purpose of an Entity Relationship Diagram (ERD) in database modeling?

To visualize individual pieces of information and their organization and relationships. Signup and view all the answers

What does an entity represent in data modeling?

A person, place, event, concept, or object about which data is collected by an organization. Signup and view all the answers

What is an attribute in data modeling?

Information captured about an entity, such as last name, home address, or email address. Signup and view all the answers

What is the difference between a physical data model and other types of data models?

A physical data model defines the physical storage and implementation of a database, whereas other models (conceptual, logical, enterprise) focus on the abstract representation of data. Signup and view all the answers

What is the role of stored procedures in database modeling?

To support database functionality and provide a way to execute complex operations. Signup and view all the answers

What is the primary focus of an Enterprise Data Model?

Identifying, defining, and relating major entities of interest in the project or organization Signup and view all the answers

What is the main difference between a Conceptual Data Model and a Logical Data Model?

A Conceptual Data Model is a high-level concept, while a Logical Data Model is a more detailed and refined model Signup and view all the answers

What is the primary characteristic of a Logical Data Model?

It is derived from the Conceptual Model and is dependent on the implementation technology but is DBMS independent Signup and view all the answers

What is the final stage of development in the design of a database?

Physical Data Model Signup and view all the answers

What is the Physical Data Model dependent on?

The target implementation technology and DBMS Signup and view all the answers

What may be included in a Physical Data Model for performance purposes?

Denormalization Signup and view all the answers