Bulk write operations in MongoDB - Mini Project: Build & Apply

Bulk Write Operations in MongoDB

📖 Scenario: You are managing a small online bookstore database. You need to update multiple book records at once to reflect new prices and add new books to the collection efficiently.

🎯 Goal: Build a MongoDB bulk write operation that updates prices for some books and inserts new book records in one go.

📋 What You'll Learn

Create a list of bulk write operations including updates and inserts

Use bulkWrite method on the books collection

Include at least two updateOne operations to change prices

Include at least two insertOne operations to add new books

Use correct filter and update syntax for updateOne

💡 Why This Matters

🌍 Real World

Bulk write operations are used in real-world applications to efficiently update or insert many records at once, reducing network overhead and improving performance.

💼 Career

Database administrators and backend developers often use bulk writes to maintain and update large datasets quickly and reliably.

1

Create initial book documents

Create a variable called initialBooks that is a list containing these exact documents: { _id: 1, title: "Learn MongoDB", price: 30 }, { _id: 2, title: "Mastering NoSQL", price: 45 }, and { _id: 3, title: "Database Basics", price: 25 }.

MongoDB

const initialBooks = [
  // Your code here
];

Need a hint?

Use square brackets to create a list and curly braces for each book document.

2

Define bulk operations list

Create a variable called bulkOps that is a list. Add two updateOne operations to update the price of books with _id 1 to 35 and _id 3 to 28. Also add two insertOne operations to insert new books with { _id: 4, title: "Advanced MongoDB", price: 50 } and { _id: 5, title: "NoSQL for Beginners", price: 40 }.

MongoDB

const initialBooks = [
  { _id: 1, title: "Learn MongoDB", price: 30 },
  { _id: 2, title: "Mastering NoSQL", price: 45 },
  { _id: 3, title: "Database Basics", price: 25 }
];

const bulkOps = [
  // Your code here
];

Need a hint?

Remember to use $set inside the update field for updateOne operations.

3

Perform bulk write operation

Write a line of code that calls bulkWrite on the books collection using the bulkOps list.

MongoDB

const initialBooks = [
  { _id: 1, title: "Learn MongoDB", price: 30 },
  { _id: 2, title: "Mastering NoSQL", price: 45 },
  { _id: 3, title: "Database Basics", price: 25 }
];

const bulkOps = [
  { updateOne: { filter: { _id: 1 }, update: { $set: { price: 35 } } } },
  { updateOne: { filter: { _id: 3 }, update: { $set: { price: 28 } } } },
  { insertOne: { document: { _id: 4, title: "Advanced MongoDB", price: 50 } } },
  { insertOne: { document: { _id: 5, title: "NoSQL for Beginners", price: 40 } } }
];

// Your code here

Need a hint?

Use the bulkWrite method on the books collection and pass bulkOps as the argument.

4

Add write concern option

Modify the bulkWrite call to include the option { writeConcern: { w: "majority" } } as the second argument to ensure the write is acknowledged by the majority of nodes.

MongoDB

const initialBooks = [
  { _id: 1, title: "Learn MongoDB", price: 30 },
  { _id: 2, title: "Mastering NoSQL", price: 45 },
  { _id: 3, title: "Database Basics", price: 25 }
];

const bulkOps = [
  { updateOne: { filter: { _id: 1 }, update: { $set: { price: 35 } } } },
  { updateOne: { filter: { _id: 3 }, update: { $set: { price: 28 } } } },
  { insertOne: { document: { _id: 4, title: "Advanced MongoDB", price: 50 } } },
  { insertOne: { document: { _id: 5, title: "NoSQL for Beginners", price: 40 } } }
];

// Your code here

Need a hint?

Add the second argument to bulkWrite with the write concern option.