Lambda function with DynamoDB - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the role of an AWS Lambda function when working with DynamoDB?

An AWS Lambda function runs code in response to events and can read from or write to DynamoDB tables without managing servers.

beginner

How do you write data to a DynamoDB table inside a Lambda function?

You use the AWS SDK inside the Lambda function to call DynamoDB's PutItem or UpdateItem API to add or modify data.

intermediate

What is the purpose of the event parameter in a Lambda function triggered by DynamoDB?

The event parameter contains information about the DynamoDB data change that triggered the Lambda, such as inserted or updated items.

intermediate

Why is it important to set proper IAM permissions for a Lambda function accessing DynamoDB?

IAM permissions control what the Lambda function can do with DynamoDB, ensuring it only accesses allowed tables and operations for security.

intermediate

What is a common use case for combining Lambda functions with DynamoDB streams?

A common use case is to automatically process or react to data changes in DynamoDB, like sending notifications or updating other systems.

What AWS service lets you run code without managing servers and can interact with DynamoDB?

A Amazon S3

B Amazon EC2

C AWS Lambda

D AWS CloudFormation

AWS Lambda runs code in response to events without needing servers and can access DynamoDB.

Which DynamoDB API call is used to add a new item inside a Lambda function?

A GetItem

B PutItem

C DeleteItem

D Scan

PutItem adds a new item or replaces an existing item in a DynamoDB table.

What does a DynamoDB stream provide to a Lambda function?

A A record of data changes

B A list of all tables

C A backup of the table

D User access logs

DynamoDB streams capture data changes like inserts, updates, and deletes for Lambda to process.

Which AWS feature controls what actions a Lambda function can perform on DynamoDB?

A IAM roles and policies

B VPC

C CloudWatch

D SNS

IAM roles and policies define permissions for Lambda to access DynamoDB securely.

What is a typical reason to trigger a Lambda function from a DynamoDB stream?

A To create a new DynamoDB table

B To backup data manually

C To delete the DynamoDB table

D To process data changes automatically

Lambda functions triggered by streams can automatically react to data changes for processing or notifications.

Explain how a Lambda function can interact with DynamoDB to handle data changes.

Think about how Lambda reacts to data updates and uses the event info.

Describe the importance of IAM permissions when using Lambda with DynamoDB.

Consider why security matters when Lambda talks to DynamoDB.