COMP 3 | QUIZ 2 | MKM 2-5 | Attempts: 44

2.

We can maintain data integrity by specifying integrity constraints.

True
False

Correct Answer

A. True

Explanation

By specifying integrity constraints, we can ensure the accuracy and consistency of data in a database. These constraints define rules and restrictions that the data must follow, such as primary key constraints, foreign key constraints, and check constraints. By enforcing these constraints, we can prevent invalid or inconsistent data from being entered into the database, thus maintaining data integrity. Therefore, the statement "We can maintain data integrity by specifying integrity constraints" is true.

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3.

This is perhaps the most significant advantage of using DBMS.

Reduction of Redundancy
Data Independence
Data Integrity

Correct Answer

A. Reduction of Redundancy

Explanation

Reduction of redundancy is the most significant advantage of using a DBMS because it eliminates the need for storing duplicate data in multiple places. By centralizing data storage and using relationships between tables, a DBMS ensures that data is stored only once, reducing the storage space required and improving data consistency. This also simplifies data updates and maintenance, as changes only need to be made in one place. Additionally, it improves data integrity by minimizing the risk of inconsistent or conflicting data.

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4.

Which is not included?

Physical Independence
Redundancy
Logical Independence

Correct Answer

A. Redundancy

Explanation

Redundancy is not included in the given options. Physical independence refers to the ability of a system or component to perform its functions without being affected by physical changes or failures in other parts. Logical independence refers to the ability of a system or component to perform its functions without being affected by logical changes or failures in other parts. Redundancy, on the other hand, refers to the inclusion of extra components or systems that are not necessary for normal operation but are available in case of failures or emergencies.

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5.

Which is not included?

Reduction of Redundancy
Logical Data Independence
Sharing of Data
Data Integrity

Correct Answer

A. Logical Data Independence

Explanation

Logical Data Independence refers to the ability to modify the logical schema of a database without affecting the application programs that access the data. It allows for changes in the structure and organization of the data without requiring changes to the programs that use the data. The other options, Reduction of Redundancy, Sharing of Data, and Data Integrity, are all important aspects of database management and are typically included in the design and implementation of a database system. Therefore, Logical Data Independence is not included in this list of database concepts.

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6.

Select the following functions of a Database Administrator.

Definition of the schema, the architecture of the three levels of the data abstraction, data independence.
Modification of the defined schema as and when required.
Definition of the storage structure i.e. and access method of the data stored i.e. sequential, indexed or direct.
Creating new used-id, password etc, and also creating the access permissions that each user can or cannot enjoy.

Correct Answer(s)

A. Definition of the schema, the architecture of the three levels of the data abstraction, data independence.
A. Modification of the defined schema as and when required.
A. Definition of the storage structure i.e. and access method of the data stored i.e. sequential, indexed or direct.
A. Creating new used-id, password etc, and also creating the access permissions that each user can or cannot enjoy.

Explanation

The functions of a Database Administrator include defining the schema, which refers to the organization and structure of the database, as well as the architecture of the three levels of data abstraction, which are the conceptual, logical, and physical levels. The DBA is also responsible for modifying the schema when necessary. Additionally, the DBA defines the storage structure and access methods for the data, such as sequential, indexed, or direct. Lastly, the DBA creates new user IDs, passwords, and access permissions for each user, determining what they can or cannot do within the database.

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7.

There are no disadvantages in using DBMS

True
False

Correct Answer

A. False

Explanation

The statement "There are no disadvantages in using DBMS" is false. While DBMS (Database Management System) offers numerous advantages such as data security, data integrity, and efficient data management, it also has certain disadvantages. Some of these include high initial setup costs, complexity in implementation and maintenance, potential for data breaches or data loss, and dependency on the DBMS vendor. Therefore, it is incorrect to claim that there are no disadvantages in using DBMS.

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8.

Known as DBA.

Database Accelerator
Datamedia Administrator
Data-ase Administrator
Database Administrator

Correct Answer

A. Database Administrator

Explanation

The correct answer is "Database Administrator" because DBA stands for Database Administrator. A Database Administrator is responsible for managing and maintaining a company's database systems, ensuring their security, performance, and availability. They handle tasks such as database design, installation, configuration, backup and recovery, and user management. A DBA plays a crucial role in ensuring the smooth operation of a database system and optimizing its performance.

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9.

This means that for any change made in the logical schema, the need to change the external schema is minimal.

Logical Independence
Logical Data Independence
Physical Data Independence
Physical Independence

Correct Answer

A. Logical Data Independence

Explanation

Logical data independence refers to the ability to make changes to the logical schema of a database without affecting the external schema or the application programs that access the data. This means that any modifications or updates made to the logical schema, such as adding or deleting tables or modifying relationships between tables, will not require changes to be made to the external schema. This allows for flexibility and ease of maintenance, as it reduces the impact of changes on the applications that rely on the database.

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10.

Creating backup and recovery policy is not essential.

True
False

Correct Answer

A. False

Explanation

Creating a backup and recovery policy is essential because it helps protect data and ensure business continuity. Without a backup and recovery policy, organizations are at risk of losing important data in case of hardware failures, natural disasters, or cyber attacks. A backup and recovery policy outlines procedures for regularly backing up data, storing backups securely, and restoring data in case of any incidents. This helps minimize downtime and potential damage to the organization's operations. Therefore, the correct answer is False.

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Comp 3 | Quiz 2 | Mkm 2-5

This means that for any change made in the physical schema, the need to change the logical schema is minimal.

Quiz Preview

We can maintain data integrity by specifying integrity constraints.

This is perhaps the most significant advantage of using DBMS.

Which is not included?

Which is not included?

Select the following functions of a Database Administrator.

There are no disadvantages in using DBMS

Known as DBA.

This means that for any change made in the logical schema, the need to change the external schema is minimal.

Creating backup and recovery policy is not essential.