Module 4: DynamoDB (NoSQL Databases)

DynamoDB is a fully managed NoSQL database service that provides fast and predictable performance with seamless scalability.

Why DynamoDB?

Traditional databases use tables with fixed columns. DynamoDB is more flexible—it's like a giant, lightning-fast spreadsheet that can grow to any size.

Mission: The User Registry

You are building a registry for a new app. You need to store user IDs and names.

Step 1: Create the Table

We need to define the Partition Key (UserId). This is how DynamoDB finds our data. Run: aws dynamodb create-table --table-name Users --attribute-definitions AttributeName=UserId,AttributeType=S --key-schema AttributeName=UserId,KeyType=HASH --provisioned-throughput ReadCapacityUnits=5,WriteCapacityUnits=5

Step 2: Save Data

Now, let's add our first user, "John Doe", to the database. Run: aws dynamodb put-item --table-name Users --item '{"UserId": {"S": "user_1"}, "Name": {"S": "John Doe"}}'