Question 1

In most commercial DBMSs,collections of entities are stored in files.

Accepted Answer

False

Question 2

SQL can be used to define tables and the relationships among them,but a graphical interface must be used to define integrity constraints and authorization rights.

Accepted Answer

SQL can be used not only to define tables and the relationships among them but also to define integrity constraints (such as primary keys, foreign keys, check constraints) and authorization rights (such as GRANT and REVOKE statements) directly through SQL commands, without the need for a graphical interface.

Question 3

In the early DBMSs,there was not a very close connection between the database and the computer programs that accessed it,so as a result the database definition was separate from the computer programs that accessed the database.

Accepted Answer

In early DBMSs, there was a close connection between the database and the computer programs, often leading to a lack of separation between database definitions and the programs accessing them.

Question 4

In transaction processing,inconsistency in the database is a concern of the user,not the DBMS processing the transaction.

Accepted Answer

The DBMS is responsible for maintaining data consistency during transaction processing, ensuring that all transactions are executed in a way that the database remains consistent before and after the transaction.

Question 5

A procedural language interface is necessary because nonprocedural access and application development tools are sometimes not efficient enough or do not provide the level of control necessary for application development.

Accepted Answer

Procedural languages provide a step-by-step set of instructions for the computer to follow, which can be more efficient and allow for greater control than nonprocedural languages. Therefore, a procedural language interface may be necessary for certain applications.

Question 6

Second generation DBMS systems are referred to as navigational because they do not require a programmer to write code to navigate among a network of linked records.

Accepted Answer

Second generation DBMS systems are referred to as navigational because they require a programmer to write code to navigate among a network of linked records, unlike later systems that use SQL for queries.

Question 7

Nonprocedural languages do not include looping statements because the user specifies what parts of the database to retrieve,not how retrieval occurs.

Accepted Answer

Nonprocedural languages, such as SQL, do not include looping statements because they rely on declarative statements to specify what data should be retrieved or manipulated, rather than procedural statements that dictate how the database should be searched or modified.

Question 8

The external level of the Three Schema Architecture allows for each group of users to have a separate view of a database tailored to that group's specific needs.

Accepted Answer

This is true. The external level of the Three Schema Architecture is designed to provide each user group with a customized view of the database that meets their specific requirements. This ensures that different user groups can work with the same database while only seeing the data that is relevant to their tasks.

Question 9

Data is said to be persistent when it resides on stable storage and is never removed or archived for the life of the business.

Accepted Answer

Persistence of data means it is stored in a non-volatile storage medium and remains accessible beyond the life of the process that created it, but it does not imply that it is never removed or archived.

Question 10

In the evolution of database technology,second-generation products were the first true DBMSs because they could manage multiple entity types and relationships.

Accepted Answer

Second-generation DBMSs were the first true DBMSs that could handle multiple entity types and relationships. First-generation DBMSs could only handle simple data structures such as tables.

Question 11

To be considered a true DBMS,a database product should be able to obtain access to data without writing a specialized computer program.

Accepted Answer

A true DBMS requires a specialized language like SQL to access and manipulate data, not necessarily a full-fledged computer program.

Question 12

Data is said to be interrelated when all of the data is stored in the same database and multiple users can access it at the same time.

Accepted Answer

Data being interrelated means that it is connected in some way, but it does not necessarily imply that all of the data is stored in the same database or that multiple users can access it simultaneously. These are characteristics of how data might be managed or accessed, not what makes it interrelated.

Question 13

File processing systems can manage only one entity.

Accepted Answer

The answer of File processing systems can manage only one...

Question 14

Database technology is vital to the functioning of modern organizations and dramatically affects most people's lives in many ways.

Accepted Answer

Database technology is used in many aspects of modern organizations, including managing customer data, inventory, and financial information. It also affects people's lives through online shopping, social media, healthcare, and many other industries that rely on databases to store and manage large amounts of information. Without database technology, many of these functions would be impossible or significantly less efficient.

Question 15

In the Three Schema Architecture,both the external and internal schemas represent the entire database.

Accepted Answer

The external schema represents how individual users view the data, while the internal schema is the physical storage representation of the entire database.

Question 16

Over the years,DBMSs have evolved to the point where they are fairly simple to learn and administer.

Accepted Answer

DBMSs (Database Management Systems) have indeed evolved over the years, becoming more powerful and feature-rich, but this complexity can make them challenging to learn and administer, especially for those without specialized training.

Question 17

The Three Schema Architecture proposes that there are three levels of database description: internal,external and physical.

Accepted Answer

The Three Schema Architecture proposes three levels of database description: internal, conceptual, and external.

Question 18

A database is said to be shared when multiple users can access the same database for multiple uses,but must take turns accessing the database.

Accepted Answer

A shared database allows multiple users to access the database simultaneously, not just in turns. It uses mechanisms like locking and transaction management to ensure data integrity and consistency.

Question 19

COBOL and Visual Basic are both examples of a nonprocedural language.

Accepted Answer

COBOL and Visual Basic are both examples of procedural languages, not nonprocedural.

Question 20

The retrieval of summarized data to support long-range decisions is a dominant feature of data warehousing,whereas a mixture of updating and retrieving data is characteristic of databases that support the day to day operations of an organization.

Accepted Answer

This statement accurately describes the difference between data warehousing and databases used for day-to-day operations. Data warehousing focuses on retrieving summarized data for long-range decision-making, while operational databases require a mix of both updating and retrieving data to support daily business processes.

Quiz 1: Introduction to Database Management