Database Management System: E-R Model Components Quiz

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What is the purpose of the view level of abstraction in a database system?

To hide the database completely from users

To make the database structure more complex

To complicate user interaction by showing the entire database

To simplify user interaction by providing a partial view of the database (correct)

Why do many users of a database system not need the entire information stored in it?

Because they prefer working with incomplete data

Because they want to complicate their interaction with the system

Because their tasks require accessing only specific parts of the database (correct)

Because they are not allowed to access all the information

How do you define a new record type in high-level programming languages according to the analogy provided?

By defining a record with at least three fields

By creating a new record with random fields

By using pre-defined record types

By associating names and types with fields (correct)

What is the logical level of abstraction used by database administrators for decision making?

Logical level Signup and view all the answers

How does the logical level of abstraction differ from the view level in a database system?

Logical level deals with user interactions, while view level focuses on system structure Signup and view all the answers

Why do databases provide multiple views for the same database?

To simplify user access to different parts of the database Signup and view all the answers

What is one of the major drawbacks of using file systems to store data?

Data redundancy and inconsistency Signup and view all the answers

Which department would benefit from a database system to store information about employee salaries and payroll taxes?

Human resources Signup and view all the answers

Why is it a disadvantage to have different files with the same information duplicated in several places?

It leads to data redundancy and inconsistency Signup and view all the answers

Which type of database system application would focus on tracking production in factories and managing the supply chain?

Manufacturing Signup and view all the answers

Why do different programmers creating files over a long period pose a challenge for file-processing systems?

It causes different programming languages to be used Signup and view all the answers

In what scenario would using a database system for generating paychecks be most beneficial?

Storing employee salary information Signup and view all the answers

In an Entity-Relationship (E-R) Model, which component is used to represent entity sets?

Rectangles Signup and view all the answers

What do ellipses represent in an E-R diagram?

Attributes Signup and view all the answers

Which component in an E-R diagram represents relationships among entity sets?

Diamonds Signup and view all the answers

How is the overall logical structure of a database represented graphically in an E-R diagram?

Using a combination of rectangles, ellipses, and diamonds Signup and view all the answers

In the relational model, what does each table represent?

Entity sets Signup and view all the answers

What does each column in a table in the relational model have?

A unique name Signup and view all the answers

What is one of the functions of a database administrator (DBA) according to the text?

Creating the original database schema Signup and view all the answers

Why does a DBA carry out changes to the schema and physical organization?

To improve performance and reflect changing organizational needs Signup and view all the answers

What does granting authorization for data access allow a DBA to do?

Regulate user access to database parts Signup and view all the answers

In database management, what does the transaction-management component ensure?

Consistent state despite system and transaction failures Signup and view all the answers

Why is routine maintenance necessary for a database?

To ensure enough free disk space and prevent data loss Signup and view all the answers

What term best describes a collection of operations that performs a single logical function in a database application?

Transaction Signup and view all the answers

What is a two-tier architecture?

A software architecture where the presentation layer runs on a client and the data layer is stored on a server Signup and view all the answers

What does the Presentation Tier do in a three-tier architecture?

Displays information related to services on a website Signup and view all the answers

Why might it make sense to use a single-tier architecture for simpler applications?

To incur lower costs by keeping applications contained in one platform Signup and view all the answers

In a three-tier architecture, what is included in the Data Tier?

Database and its management programming Signup and view all the answers

Which component in a two-tier system runs on the client?

Presentation layer Signup and view all the answers

What represents a two-tier architecture?

Separating presentation and data layers into different locations Signup and view all the answers