CIS321: Database Concepts and Design

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What is a Data Model?

Back

A set of concepts to describe the structure of a database and how to manipulate it.

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What are the types of Data Models?

Back

1. Conceptual Data Models 2. Physical Data Models 3. Implementation Data Models 4. Self-Describing Data Models.

Front

What is a Database Schema?

Back

The description of a database, including its structure and data types.

Front

What is a Database State?

Back

The actual data stored in a database at a specific time.

Front

What is Data Independence?

Back

The ability to change the database structure without changing the applications that use it.

Front

What is a Data Definition Language (DDL)?

Back

A language used to define the structure of a database.

Front

What is a Data Manipulation Language (DML)?

Back

A language used to retrieve and update data in a database.

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What is the Three-Schema Architecture?

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A way to define database schemas at three levels: internal, conceptual, and external.

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What is a Centralized DBMS?

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A system where everything is combined into a single system for processing.

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What is a Client-Server Architecture?

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A system where clients access specialized servers for different functions.