Master Node.js Database Management for Full-Stack Web Development

Question 1

To add a new document to a collection in Node.js Database, which function should you use?

Accepted Answer

insertOne()

Answer

find()

Answer

update()

Answer

deleteOne()

Question 2

Which Node.js module is specifically designed for interacting with databases?

Accepted Answer

mongoose

Answer

Sequelize

Answer

Prisma

Answer

express

Question 3

To create a new document in MongoDB using Mongoose, which method should you employ?

Accepted Answer

create()

Answer

save()

Answer

insert()

Answer

add()

Question 4

What key advantage does Node.js offer for database interactions?

Accepted Answer

Asynchronous and non-blocking I/O

Answer

Extensive database support

Answer

Built-in database encryption

Answer

Reduced server load

Question 5

In the context of Node.js, what is the primary purpose of a database schema?

Accepted Answer

Defines the structure and properties of database objects

Answer

Connects to the database server

Answer

Executes queries and updates

Question 6

In Node.js, how do you establish a connection to a MongoDB database using Mongoose?

Accepted Answer

mongoose.connect()

Answer

mongoose.createConnection()

Answer

mongoose.init()

Answer

mongoose.attach()

Question 7

Which MongoDB query operator is used for partial string matching?

Accepted Answer

$regex

Answer

$like

Answer

$contains

Answer

$match

Question 8

Explain the purpose of indexing in the context of Node.js databases.

Accepted Answer

Improves query performance by optimizing data retrieval

Answer

Provides data encryption for security

Answer

Reduces database size through data compression

Question 9

When designing database schemas, what is considered a best practice?

Accepted Answer

Follow normalization principles to avoid data redundancy and maintain data integrity

Answer

Create complex and nested data structures

Answer

Use as many different data types as possible

Question 10

In Node.js, which module do we primarily use for database interaction?

Accepted Answer

monk

Answer

express

Answer

axios

Answer

body-parser

Question 11

In MongoDB queries, which operator do we use to perform a logical OR operation?

Accepted Answer

$or

Answer

$and

Answer

$in

Answer

$eq

Question 12

In MongoDB, which data type should we use to store binary data?

Accepted Answer

BinData

Answer

String

Answer

Number

Question 13

What is the primary purpose of the 'aggregate' method in MongoDB?

Accepted Answer

To perform complex data processing and aggregation operations on collections.

Answer

To create new documents in a collection.

Answer

To update existing documents in a collection.

Question 14

Which of the following is an advantage of using Node.js for database interaction?

Accepted Answer

Asynchronous, non-blocking I/O operations.

Answer

Automatic data type conversion.

Answer

Built-in support for SQL queries.

Answer

Reduced code complexity compared to PHP.

Question 15

Which Node.js module is primarily used for interacting with MongoDB?

Accepted Answer

mongoose

Answer

sequelize

Answer

knex

Answer

mysql2

Question 16

How can you retrieve a document by its unique identifier using Node.js and MongoDB?

Accepted Answer

findById()

Answer

findByPk()

Answer

get()

Answer

findOne()

Question 17

Which operator is used for modifying specific fields within documents in MongoDB using Node.js?

Accepted Answer

$set

Answer

$modify

Answer

$update

Answer

$change

Question 18

How can you delete a document from MongoDB using Node.js?

Accepted Answer

deleteOne()

Answer

erase()

Answer

removeOne()

Answer

destroy()

Question 19

Which of the following is an advantage of using Mongoose for database interaction in Node.js?

Accepted Answer

Schema validation

Answer

Improved security

Answer

Automatic pagination

Answer

Faster queries

Question 20

How can you establish a connection to a MongoDB database using Node.js?

Accepted Answer

MongoClient.connect()

Answer

Mongo.connect()

Answer

Mongoose.connect()

Answer

DB.connect()

Question 21

Which method is used to close a connection to a MongoDB database in Node.js?

Accepted Answer

close()

Answer

destroy()

Answer

end()

Answer

disconnect()

Question 22

Which of the following is NOT a best practice for working with databases in Node.js?

Accepted Answer

Using global database connections

Answer

Using parameterized queries

Answer

Establishing connections lazily

Answer

Closing connections when they are no longer needed

Question 23

What is the primary purpose of the `connect` method in Mongoose?

Accepted Answer

Establishing a connection to a database

Answer

Creating a new database

Answer

Closing the database connection

Answer

Executing database queries

Question 24

Which Mongoose schema type is appropriate for storing dates?

Accepted Answer

Date

Answer

Object

Answer

Number

Answer

String

Question 25

What is the correct syntax for creating a new document using Mongoose?

Accepted Answer

const newDocument = new ModelName({ ...data })

Answer

const newDocument = ModelName.create({ ...data })

Answer

const newDocument = ModelName.build({ ...data })

Answer

const newDocument = ModelName.insert({ ...data })

Question 26

Which Mongoose method can be used to retrieve all documents from a specified collection?

Accepted Answer

.find()

Answer

.get()

Answer

.query()

Question 27

Explain the key difference between a MongoDB collection and a Mongoose model.

Accepted Answer

A MongoDB collection is the raw data stored in the database, while a Mongoose model serves as a JavaScript representation of that collection.

Answer

A collection is a group of documents, while a model represents a single document.

Question 28

What is the purpose of the `findOneAndUpdate` method in MongoDB?

Accepted Answer

To locate and update a single document in an atomic operation

Answer

To delete a single document

Answer

To update multiple documents matching a specific query

Answer

To replace a document with a new one

Question 29

Which operator in MongoDB queries represents a logical AND operation?

Accepted Answer

$and

Answer

$lt

Answer

$gt

Answer

$or

Question 30

Which Node.js module is primarily used to connect to and interact with MongoDB?

Accepted Answer

mongodb

Answer

mysql

Answer

postgresql

Answer

mssql

Question 31

What is the correct syntax to create a new database collection using Node.js?

Accepted Answer

db.createCollection('collectionName')

Answer

db.addCollection('collectionName')

Answer

db.collection('collectionName').create()

Answer

db.create('collectionName')

Question 32

Which method is used to insert a single document into a MongoDB collection using Node.js?

Accepted Answer

insertOne()

Answer

addOne()

Answer

create()

Answer

insert()

Question 33

Which method is used to update a specific document in a MongoDB collection?

Accepted Answer

updateOne()

Answer

update()

Answer

replaceOne()

Answer

modify()

Question 34

What is the primary purpose of using a projection in MongoDB queries?

Accepted Answer

To limit the fields returned in the result, optimizing data retrieval and reducing network traffic.

Answer

To aggregate the results

Answer

To filter the results

Answer

To sort the results

Question 35

Which of the following is a valid aggregation pipeline stage to calculate the average of a field in MongoDB?

Accepted Answer

{ $avg: '$field_name' }

Answer

{ $average: '$field_name' }

Answer

{ avg: '$field_name' }

Answer

{ avg: field_name }

Question 36

How do you establish a connection to a MongoDB database in Node.js using a connection string?

Accepted Answer

MongoClient.connect()

Answer

MongoDB.connect()

Answer

mongo.connect()

Answer

db.connect()

Question 37

Which of the following is an advantage of using a NoSQL database like MongoDB over a relational database for certain use cases?

Accepted Answer

Flexibility and scalability for handling unstructured and diverse data types.

Answer

Stronger data integrity and consistency

Answer

Improved performance for complex queries

Question 38

What is the primary purpose of using an ORM (Object-Relational Mapping) library in Node.js database development?

Accepted Answer

To simplify database interactions, reduce boilerplate code, and improve developer productivity.

Answer

To enforce data integrity and constraints

Answer

To improve database performance

Question 39

Which Node.js module is commonly used to interact with MongoDB databases?

Accepted Answer

mongoose

Answer

mysql

Answer

express

Question 40

In Node.js database interactions, what is the primary function of the 'find()' method?

Accepted Answer

Retrieve data from the database based on specific criteria.

Answer

Update an existing document in the database.

Answer

Create a new document in the database.

Question 41

Which type of database is known for its document-oriented structure and scalability?

Accepted Answer

MongoDB

Answer

MySQL

Answer

SQLite

Question 42

How would you define a schema for a 'users' collection in Mongoose?

Accepted Answer

const userSchema = new mongoose.Schema({ ... });

Answer

const userSchema = mongoose.define({ ... });

Answer

const users = mongoose.createSchema({ ... });

Answer

const users = mongoose.defineSchema({ ... });

Question 43

What is the role of a database driver in Node.js database interaction?

Accepted Answer

It acts as a bridge between the Node.js application and the database server.

Answer

Performs data encryption and decryption.

Answer

Handles data validation and sanitization.

Question 44

What is the key difference between 'findOne()' and 'find()' in Mongoose?

Accepted Answer

'findOne()' retrieves a single document, while 'find()' returns an array of documents.

Answer

'findOne()' is used for updates, while 'find()' is for retrieval.

Answer

'findOne()' retrieves all documents, while 'find()' returns only the first.

Question 45

How do you connect to a MySQL database using Node.js?

Accepted Answer

Using the 'mysql' module and providing the connection details.

Answer

By directly referencing the database files on the server.

Answer

Through a built-in Node.js database API.

Question 46

What is the concept of asynchronous database operations in Node.js?

Accepted Answer

Database operations run in the background, allowing the Node.js application to continue processing other tasks.

Answer

Database operations are executed sequentially, waiting for each to complete before proceeding.

Question 47

What is the primary function of a 'callback' function in Node.js database operations?

Accepted Answer

To handle the result of a database operation after it has finished.

Answer

To define the structure of the data being stored.

Answer

To perform data validation and sanitization before saving to the database.

Question 48

Which of these databases is **less commonly** used with Node.js compared to the others?

Accepted Answer

Oracle Database

Answer

MongoDB

Answer

PostgreSQL

Answer

MySQL

Question 49

What is the primary purpose of the `npm install` command when working with Node.js databases?

Accepted Answer

To install the necessary database drivers or libraries.

Answer

To establish a connection to the database.

Answer

To create a new database schema.

Answer

To run database queries.

Question 50

Which Node.js module is specifically designed for interacting with MongoDB databases?

Accepted Answer

mongoose

Answer

pg

Answer

express

Answer

mysql

Question 51

What does the following code snippet do? `db.collection('users').insertOne({ name: 'John Doe' })`

Accepted Answer

Adds a new user document with the name 'John Doe' to the 'users' collection.

Answer

Retrieves all user documents from the 'users' collection.

Answer

Deletes a user document from the 'users' collection.

Answer

Updates an existing user document in the 'users' collection.

Question 52

What is the primary advantage of using an Object Relational Mapper (ORM) like Sequelize with Node.js and databases?

Accepted Answer

Simplifies database interaction by mapping objects to database tables.

Answer

Provides advanced database security features.

Answer

Improves the performance of database queries.

Answer

Automatically generates database schemas.

Question 53

How can you ensure data consistency when multiple requests are made to the database simultaneously in Node.js?

Accepted Answer

Implement transaction management to group operations.

Answer

Use database caching to reduce database load.

Answer

Employ asynchronous programming to handle requests concurrently.

Answer

Increase the database server's capacity.

Question 54

What is the role of a database driver in Node.js?

Accepted Answer

It acts as a translator, enabling Node.js to communicate with the database.

Answer

It manages the database schema and data types.

Answer

It performs data validation and sanitization.

Answer

It handles database security and access control.

Question 55

Which of these is a good practice for handling database connection errors in Node.js?

Accepted Answer

Use try-catch blocks and implement retry mechanisms for temporary errors.

Answer

Log the error and display it directly to the user.

Answer

Ignore the error and continue execution, as it may be temporary.

Answer

Immediately exit the application to prevent further issues.

Question 56

What is the primary benefit of using a NoSQL database like MongoDB with Node.js?

Accepted Answer

Flexibility in handling unstructured data and scalability for large datasets.

Answer

Advanced security features and built-in data validation.

Answer

Simplified data modeling and easy data migration.

Answer

High-performance relational database operations and strict data integrity.