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Questions and Answers
Questions and Answers
What does a database-management system (DBMS) manage?
What does a database-management system (DBMS) manage?
- Graphical interfaces for visualizations
- Interrelated data and programs to access that data (correct)
- Only numeric data
- Physical storage devices
What is the primary goal of a DBMS?
What is the primary goal of a DBMS?
To provide a way to store and retrieve database information conveniently and efficiently.
Data can be interpreted without explicit meaning.
Data can be interpreted without explicit meaning.
False (B)
What is the term used to describe a unit of data?
What is the term used to describe a unit of data?
Information is interpreted data supplied with _______.
Information is interpreted data supplied with _______.
What distinguishes knowledge from information?
What distinguishes knowledge from information?
What is essential for ensuring safety of information stored in a database system?
What is essential for ensuring safety of information stored in a database system?
What forms the focus of the concepts and techniques discussed in this chapter?
What forms the focus of the concepts and techniques discussed in this chapter?
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Study Notes
Study Notes
Data, Information & Knowledge
- Data are known facts that can be recorded and have implicit meaning.
- A datum is a unit of data representing a single piece of information.
- Information is interpreted data, with semantics added. It's data with meaning.
- Knowledge is the practical application of information and involves a personal experience.
Database Management System (DBMS)
- A DBMS is a collection of interrelated data and associated programs to access and manage the data.
- The collection of data within a DBMS is called a database.
- The primary aim of a DBMS is to store and retrieve information efficiently and conveniently.
Database Design & Data Modeling
- Data modeling is a fundamental part of the database design process, defining the structure of the database to store and manage information.
- E-R (Entity-Relationship) Model is a common data modeling technique.
- ER Model represents the entities and relationships within a database.
- The ER model components consist of entities, attributes, and relationships.
- Entities are objects or concepts that are represented in the database.
- Attributes are characteristics describing an entity.
- Relationships define connections between entities.
Database System Requirements
- Database systems must ensure reliable information storage, even in system crashes or amidst unauthorized access.
- Safeguarding information integrity is crucial when shared among users to avoid inconsistencies.
- Database management is vital for organizations due to the importance of information in various processes.
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