Why DynamoDB pairs with Lambda - See It in Action

Why DynamoDB Pairs with Lambda

📖 Scenario: You are building a simple serverless application that stores user feedback in a database. You want to automatically process each new feedback entry as soon as it is saved.

🎯 Goal: Build a DynamoDB table and connect it with an AWS Lambda function that triggers when new data is added. This setup will help you understand why DynamoDB and Lambda work well together for real-time data processing.

📋 What You'll Learn

Create a DynamoDB table named UserFeedback with a primary key FeedbackID of type string.

Create a Lambda function named ProcessFeedback that will be triggered by new inserts into the DynamoDB table.

Configure the DynamoDB stream on the UserFeedback table to capture new item inserts.

Set up the Lambda trigger to invoke ProcessFeedback whenever a new feedback item is added.

💡 Why This Matters

🌍 Real World

This project shows how serverless applications can react instantly to database changes without managing servers.

💼 Career

Understanding how DynamoDB and Lambda work together is essential for building scalable, event-driven cloud applications.

1

Create DynamoDB Table

Create a DynamoDB table named UserFeedback with a primary key called FeedbackID of type string.

DynamoDB

# Your code here to create the DynamoDB table UserFeedback with FeedbackID as string primary key

Need a hint?

Use the AWS CLI create-table command with the correct attribute definitions and key schema.

2

Enable DynamoDB Stream

Enable a DynamoDB stream on the UserFeedback table to capture new item inserts only.

DynamoDB

# Your code here to enable DynamoDB stream for new inserts

Need a hint?

Use update-table to enable streams with NEW_IMAGE to capture new inserts.

3

Create Lambda Function

Create a Lambda function named ProcessFeedback that will process new feedback items.

DynamoDB

# Your code here to create the Lambda function ProcessFeedback

Need a hint?

Use aws lambda create-function with the correct function name, runtime, handler, and role.

4

Connect DynamoDB Stream to Lambda

Configure the DynamoDB stream on UserFeedback to trigger the Lambda function ProcessFeedback on new inserts.

DynamoDB

# Your code here to add event source mapping from DynamoDB stream to Lambda ProcessFeedback

Need a hint?

Use aws lambda create-event-source-mapping with the DynamoDB stream ARN and Lambda function name.