NoSQL Databases: A Comprehensive Guide for Master's Students

Question 1

Which of the following is a typical application scenario for using a key-value NoSQL database?

Accepted Answer

Storing user account information

Answer

Analyzing social media trends

Answer

Processing financial transactions

Answer

Visualizing geographic data

Question 2

What does the CAP theorem in distributed computing systems state?

Accepted Answer

A system cannot simultaneously achieve consistency, availability, and partition tolerance.

Answer

A database must prioritize scalability over durability.

Answer

Performance, availability, and durability are interdependent properties.

Answer

NoSQL databases are inherently more scalable than relational databases.

Question 3

Which NoSQL database is renowned for its high availability and low latency characteristics?

Accepted Answer

Redis

Answer

Cassandra

Answer

MongoDB

Answer

Neo4j

Question 4

Which of the following is a key characteristic of NoSQL databases?

Accepted Answer

Schema flexibility

Answer

Full ACID compliance

Answer

High consistency

Answer

Limited data integrity

Question 5

Which data model is commonly used in NoSQL databases for storing unstructured data?

Accepted Answer

Document

Answer

Relational

Answer

Graph

Answer

Hierarchical

Question 6

Which of the following applications is best suited for NoSQL databases?

Accepted Answer

Online shopping cart with millions of products

Answer

Financial transactions requiring high consistency

Answer

Hotel reservation system with fixed schemas

Answer

Small-scale databases for personal use

Question 7

Which of the following is a potential disadvantage of using NoSQL databases?

Accepted Answer

Lack of standardization

Answer

Limited data integrity

Answer

High cost of implementation

Answer

Low performance

Question 8

Which of the following is a popular document-oriented NoSQL database?

Accepted Answer

MongoDB

Answer

Redis

Answer

Cassandra

Answer

Neo4j

Question 9

Which fundamental feature distinguishes NoSQL databases from traditional relational databases?

Accepted Answer

Schema-less data structure

Answer

Strict data consistency guarantees

Answer

Use of complex data types

Answer

Support for multi-row transactions

Question 10

Which NoSQL database type is optimized for handling large volumes of data with a time-based sequence?

Accepted Answer

Time-series database

Answer

Document database

Answer

Key-value store

Answer

Graph database

Question 11

What primary advantage do document-oriented NoSQL databases provide?

Accepted Answer

Flexible data storage and extensibility

Answer

Efficient querying based on complex relationships

Answer

Optimal performance for structured data processing

Answer

Guaranteed data integrity and consistency

Question 12

What is the primary purpose of implementing a sharding strategy in NoSQL databases?

Accepted Answer

Distributing data across multiple servers for scalability

Answer

Improving data consistency and reliability

Answer

Reducing data storage costs

Answer

Enhancing data security

Question 13

What is the key advantage of using a graph database?

Accepted Answer

Efficient representation and traversal of interconnected data

Answer

High performance for complex data analytics

Answer

Simplified data modeling and schema design

Answer

Reduced storage space requirements

Question 14

Which of the following is NOT a type of NoSQL database?

Accepted Answer

Relational database

Answer

Key-value store

Answer

Wide-column store

Answer

Document database

Question 15

Which NoSQL database type is most suitable for storing large amounts of unstructured text data?

Accepted Answer

Document database

Answer

Key-value store

Answer

Graph database

Answer

Time-series database

Question 16

What is the purpose of a schema-less NoSQL database?

Accepted Answer

To allow for flexible data models

Answer

To improve performance

Answer

To reduce storage requirements

Answer

To enhance data consistency

Question 17

Which NoSQL database type is often used for storing and analyzing social network data?

Accepted Answer

Graph database

Answer

Key-value store

Answer

Document database

Answer

Time-series database

Question 18

What does the CAP theorem state in the context of distributed databases?

Accepted Answer

A distributed database can only guarantee two out of three properties: Consistency, Availability, Partition tolerance

Answer

Question 19

Which NoSQL database type is suitable for storing and analyzing time-series data?

Accepted Answer

Time-series database

Answer

Key-value store

Answer

Document database

Answer

Graph database

Question 20

Which characteristic is NOT associated with NoSQL databases?

Accepted Answer

Adherence to ACID properties

Answer

Schema-agility

Answer

Horizontally scalable

Answer

High availability

Question 21

Which consistency model guarantees that all database replicas are synchronized before a write operation is deemed complete?

Accepted Answer

Strict consistency

Answer

Eventual consistency

Answer

Read-after-write consistency

Answer

Monotonic reads

Question 22

Explain the distinction between a primary index and a secondary index in the context of a NoSQL database.

Accepted Answer

A primary index facilitates rapid data retrieval, whereas a secondary index offers supplementary indexing capabilities.

Answer

A secondary index facilitates rapid data retrieval, whereas a primary index offers supplementary indexing capabilities.

Answer

Both primary and secondary indexes facilitate rapid data retrieval, but secondary indexes are more efficient.

Answer

Both primary and secondary indexes offer supplementary indexing capabilities, but primary indexes are more efficient.

Question 23

Which of the following is NOT a type of NoSQL database model?

Accepted Answer

Relational Database

Answer

Key-Value Store

Answer

Document Database

Answer

Graph Database

Question 24

Which of the following is a key-value store NoSQL database, used to store data as a collection of key-value pairs?

Accepted Answer

Redis

Answer

MongoDB

Answer

Cassandra

Answer

HBase

Question 25

What is a significant advantage of document-oriented databases like MongoDB?

Accepted Answer

Flexible schema, allowing for easy adaptation to changing data structures

Answer

Support for complex queries, enabling advanced data retrieval

Answer

High scalability, supporting large data volumes with ease

Answer

Low latency, providing fast data access

Question 26

The CAP theorem in distributed computing states that a system can only simultaneously guarantee two out of the following three properties. Which three properties are referred to in the CAP theorem?

Accepted Answer

Consistency, availability, and partition tolerance

Answer

Consistency, durability, and partition tolerance

Answer

Availability, durability, and partition tolerance

Answer

Consistency, availability, and scalability

Question 27

In NoSQL databases, what is the primary distinction between a primary key and a secondary index?

Accepted Answer

A primary key uniquely identifies each record in a table, while a secondary index provides an alternative way to search for records using different criteria.

Answer

A secondary index uniquely identifies each record in a table, while a primary key provides an alternative way to search for records using different criteria.

Answer

Both primary keys and secondary indexes uniquely identify records in a table.

Answer

There is no distinction between a primary key and a secondary index in NoSQL databases.

Question 28

In NoSQL databases, what is the purpose of a key-value pair?

Accepted Answer

It is a fundamental data structure that stores a key and its corresponding value.

Answer

It is a data structure that stores a key, its value, and a timestamp indicating when the data was modified.

Answer

It is a data structure that stores a key, its value, and a unique identifier for the data item.

Answer

It is a data structure that stores a key, its value, and a reference to another data structure.

Question 29

Which characteristic distinguishes a document-oriented NoSQL database?

Accepted Answer

Data is stored in adaptable documents with flexible schemas.

Answer

Data is stored in rigidly defined tables with fixed schemas.

Answer

Data is accessed via a structured query language (SQL).

Answer

Data is updated and retrieved using a key-value pair interface.

Question 30

Which advantage is associated with utilizing a key-value store NoSQL database?

Accepted Answer

Significant scalability and adaptability.

Answer

Guarantees of robust data consistency.

Answer

Advanced query capabilities.

Answer

Support for intricate data types.

Question 31

What primary purpose does a wide-column database serve?

Accepted Answer

Storing and managing extensive tables with numerous columns.

Answer

Storing and querying data featuring intricate relationships.

Answer

Storing and retrieving data using key-value pairs.

Answer

Storing and processing time-series data.

Question 32

What advantage do graph databases offer?

Accepted Answer

Efficient representation and querying of complex data relationships.

Answer

Storage of large volumes of structured data.

Answer

Ensuring high data consistency.

Answer

Supporting advanced analytical queries.

Question 33

Define the concept of denormalization in NoSQL databases.

Accepted Answer

Reducing data redundancy by duplicating data in multiple locations.

Answer

Organizing data hierarchically to enhance query performance.

Answer

Enforcing strict data consistency rules to prevent data corruption.

Answer

Using a schema-on-write approach to maintain data integrity.

Question 34

What is a primary advantage of using a key-value store NoSQL database?

Accepted Answer

Fast and efficient data retrieval

Answer

High data consistency

Answer

Flexible schema design

Answer

Complex query capabilities

Question 35

What is the concept of denormalization in NoSQL databases?

Accepted Answer

Storing duplicate data to improve query performance

Answer

Splitting data into multiple tables for better organization

Answer

Enforcing strict data integrity rules

Answer

Creating indexes to speed up data retrieval

Question 36

Which of the following is a popular example of a document-oriented NoSQL database?

Accepted Answer

MongoDB

Answer

Redis

Answer

Cassandra

Answer

Neo4j

Question 37

What is the purpose of a NoSQL database schema?

Accepted Answer

To define the structure of data

Answer

To enforce data consistency

Answer

To ensure efficient data access

Answer

To prevent data duplication

Question 38

Which NoSQL data model is most appropriate for storing large amounts of unstructured data with varying fields, such as website session logs or online reviews?

Accepted Answer

Document store

Answer

Key-value store

Answer

Graph database

Answer

Wide-column store

Question 39

What is the primary advantage of using a wide-column store?

Accepted Answer

Efficiently managing large data sets with similar data types and columns, such as financial transactions or sensor data.

Answer

Supporting complex data relationships, such as social networks or family trees.

Answer

Providing low latency for read operations, making it suitable for high-performance applications.

Answer

Allowing flexible schema design, enabling easy addition or modification of data types.

Question 40

What is the purpose of using a sharding technique in NoSQL databases?

Accepted Answer

Distributing data across multiple servers to improve scalability and handle large data sets.

Answer

Enforcing data consistency across multiple nodes, ensuring data integrity during updates.

Answer

Managing data backups and recovery, providing redundancy and protection against data loss.

Answer

Optimizing query performance by partitioning data based on specific criteria.