NoSQL Databases: A Comprehensive Guide for Advanced Diploma in Information Technology Students

Question 1

Which of the following is NOT a characteristic of NoSQL databases?

Accepted Answer

Support for ACID transactions

Answer

Schema-less

Answer

Horizontally scalable

Answer

Eventual consistency

Question 2

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

Accepted Answer

Document database

Answer

Key-value store

Answer

Column family store

Answer

Graph database

Question 3

Which of the following is a popular example of a document database?

Accepted Answer

MongoDB

Answer

Redis

Answer

Cassandra

Answer

Neo4j

Question 4

What is the purpose of using a column family store?

Accepted Answer

To store data with varying columns, enabling efficient data management for specific use cases

Answer

To improve query performance by optimizing data access patterns

Answer

To ensure data durability by replicating data across multiple nodes

Answer

To support relational data models, allowing for seamless integration with existing systems

Question 5

Which of the following is NOT a use case for NoSQL databases?

Accepted Answer

Banking systems that require strong data consistency and transactional guarantees

Answer

Social media applications with vast amounts of unstructured user data

Answer

E-commerce platforms that require high scalability and flexibility

Answer

Data warehousing systems that involve complex data analysis and reporting

Question 6

What is the CAP theorem in the context of NoSQL databases?

Accepted Answer

It states that NoSQL databases can only provide two out of three guarantees: Consistency, Availability, and Partition Tolerance

Answer

It states that NoSQL databases can always provide all three guarantees: Consistency, Availability, and Partition Tolerance

Answer

It states that NoSQL databases can only provide Consistency and Availability

Answer

It states that NoSQL databases can only provide Availability and Partition Tolerance

Question 7

Which of the following is NOT a key characteristic of NoSQL databases?

Accepted Answer

Strict adherence to ACID properties

Answer

Flexible schema

Answer

Horizontal scalability

Answer

Distribution and fault tolerance

Question 8

Which type of NoSQL database is most suitable for storing hierarchical data structures?

Accepted Answer

Graph database

Answer

Key-value store

Answer

Document store

Answer

Column-family store

Question 9

What is a primary advantage of NoSQL databases compared to relational databases?

Accepted Answer

Enhanced scalability

Answer

Improved data integrity

Answer

Increased security measures

Answer

Full compatibility with SQL syntax

Question 10

When designing a NoSQL database schema, which of the following is a crucial consideration?

Accepted Answer

Flexibility to accommodate evolving data requirements

Answer

Entity-relationship modelling

Answer

Normalization and denormalization of data

Answer

Support for advanced querying and joins

Question 11

Which CAP theorem property is prioritized by Cassandra?

Accepted Answer

Availability

Answer

Consistency

Answer

Partition tolerance

Answer

Durability

Question 12

Which tool is commonly used for managing and querying NoSQL databases?

Accepted Answer

MongoDB Compass

Answer

SQL Server Management Studio

Answer

Oracle Database Control

Answer

MySQL Workbench

Question 13

What is the key distinction between document stores and column-family stores?

Accepted Answer

Document stores prioritize flexibility, while column-family stores optimize for data retrieval speed.

Answer

Document stores support complex queries, while column-family stores do not.

Answer

Document stores have no schema, while column-family stores require a predefined schema.

Answer

Document stores are distributed, while column-family stores are always centralized.

Question 14

What key advantage do NoSQL databases offer over traditional relational databases?

Accepted Answer

Adaptable data structure

Answer

Strong data consistency

Answer

Faster transaction speeds

Question 15

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

Accepted Answer

Relational

Answer

Document-oriented

Answer

Key-value

Answer

Graph-oriented

Question 16

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

Accepted Answer

A database can guarantee at most two out of the three properties: consistency, availability, and partition tolerance.

Answer

A database can guarantee all three properties: consistency, availability, and partition tolerance.

Answer

The CAP theorem only applies to relational databases.

Answer

The CAP theorem is irrelevant to database management systems.

Question 17

Name a popular document-oriented NoSQL database.

Accepted Answer

MongoDB

Answer

Cassandra

Answer

Redis

Answer

Neo4j

Question 18

Which of the following is a distinctive feature of a key-value NoSQL database?

Accepted Answer

Data is stored in key-value pairs.

Answer

Data is structured in the form of documents.

Answer

Data is organized in a hierarchical structure.

Answer

Data is connected in a network of nodes and relationships.

Question 19

Explain the difference between consistent and eventually consistent NoSQL databases.

Accepted Answer

Consistent databases ensure immediate data consistency, while eventually consistent databases guarantee consistency over time.

Answer

Consistent databases guarantee eventual consistency, while eventually consistent databases provide immediate consistency.

Answer

There is no distinction between consistent and eventually consistent NoSQL databases.

Answer

Consistent databases are consistently faster than eventually consistent databases.

Question 20

Which of the following is NOT a characteristic of NoSQL databases?

Accepted Answer

Support for strict ACID transactions that guarantee atomicity, consistency, isolation, and durability.

Answer

High scalability and availability achieved through distributed architectures and replication.

Answer

Flexible or schema-less data models that allow for dynamic data structures.

Question 21

Which of the following is a key advantage of using a key-value NoSQL database?

Accepted Answer

Fast and efficient data retrieval based on a unique key, enabling quick access to specific data items.

Answer

Ability to handle complex data relationships and perform complex queries efficiently.

Answer

Strong data consistency across multiple nodes, ensuring data integrity in distributed environments.

Answer

Support for advanced SQL queries, providing a familiar syntax and query language for data retrieval.

Question 22

What is the primary purpose of a consistency level in a NoSQL database?

Accepted Answer

To define the level of consistency guaranteed by the database, determining the trade-off between data availability and consistency.

Answer

To protect data from unauthorized access and maintain data security.

Answer

To control the performance of the database by optimizing resource allocation and query execution.

Question 23

Which of the following is a key benefit of using a column family database?

Accepted Answer

Efficient storage and retrieval of large datasets with similar columns, optimizing for data locality and reducing query times.

Answer

Support for complex data types, including objects, arrays, and nested structures, enabling the storage of diverse data formats.

Answer

Ability to enforce referential integrity, ensuring data accuracy and preventing data inconsistencies.

Question 24

What is the fundamental difference between a structured and an unstructured NoSQL database?

Accepted Answer

Structured databases enforce a defined schema that specifies data types and relationships, while unstructured databases allow for flexible and dynamic data structures.

Answer

Unstructured databases can only store text data, while structured databases can store various data types.

Answer

Structured databases are always faster than unstructured databases due to their optimized data organization.

Question 25

Which NoSQL database type is best suited for applications that require real-time data processing and analytics?

Accepted Answer

Graph database

Answer

Document database

Answer

Key-value database

Answer

Column family database

Question 26

What is the role of a schema in the context of a NoSQL database?

Accepted Answer

In NoSQL databases, schemas are often flexible and adaptable, providing a loose structure for data storage while allowing for data evolution and dynamic changes.

Answer

Schemas in NoSQL databases are strictly enforced, ensuring data integrity and preventing data loss.