Lambda trigger on stream events in DynamoDB - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a Lambda trigger on DynamoDB stream events?

It is a way to automatically run AWS Lambda functions when changes happen in a DynamoDB table, like adding, updating, or deleting items.

beginner

How does DynamoDB Streams help Lambda functions?

DynamoDB Streams captures table activity and sends event records to Lambda, which then processes these changes in near real-time.

beginner

What types of events can trigger a Lambda function from a DynamoDB stream?

INSERT (new item added), MODIFY (item updated), and REMOVE (item deleted) events can trigger Lambda functions.

intermediate

Why use Lambda triggers on DynamoDB streams instead of polling the table?

Lambda triggers respond instantly to changes without constant checking, saving resources and providing faster reactions.

intermediate

What must you enable on a DynamoDB table to use Lambda triggers on stream events?

You must enable DynamoDB Streams on the table and configure the stream to capture the desired data (keys only, new image, old image, or both).

Which DynamoDB stream event type triggers when an item is deleted?

A UPDATE

B MODIFY

C INSERT

D REMOVE

REMOVE events occur when an item is deleted from the table.

What must be enabled on a DynamoDB table to use Lambda triggers on stream events?

A DynamoDB Streams

B Auto Scaling

C Global Tables

D Backup and Restore

DynamoDB Streams must be enabled to capture changes and trigger Lambda functions.

Which of the following is NOT a benefit of using Lambda triggers on DynamoDB streams?

A Manual polling of the table for changes

B Automatic scaling of Lambda functions

C Reduced resource usage compared to polling

D Real-time processing of data changes

Manual polling is not a benefit; Lambda triggers avoid the need for polling.

What kind of data can DynamoDB Streams capture for Lambda triggers?

A Only the primary key

B New item image, old item image, or both

C Only deleted items

D Only updated attributes

Streams can capture new images, old images, or both depending on configuration.

When a Lambda function is triggered by a DynamoDB stream, what does it receive?

A The entire DynamoDB table

B Only the updated attributes

C A batch of event records describing changes

D A snapshot of the database

Lambda receives a batch of event records describing the changes made.

Explain how a Lambda trigger works with DynamoDB stream events.

Think about what happens when data changes in the table.

List the steps to set up a Lambda trigger on DynamoDB stream events.

Consider both DynamoDB and Lambda configurations.