You work in a startup company, and your team is developing a new Android App. Whenever a user uploads a photo in the App, a notification will be sent to his friends immediately. An AWS DynamoDB table has been created to save the photo information per user, and the DynamoDB Stream is enabled to capture the item modifications. Which service can integrate with DynamoDB Stream, process its events and send notifications?

Answer options:

A.A Lambda function.
B.A SNS notification.
C.A CloudWatch Events rule.
D.A S3 bucket.

Correct Answer – A
The Stream feature can be enabled in DynamoDB as below:
After it is enabled, a time-ordered sequence of item-level operations is captured which can be accessed via its API.
Option A is CORRECT: Because DynamoDB Stream can be configured as a trigger for a Lambda function which picks up a new stream record and gets it processed.
Option B is incorrect: Because SNS notification cannot integrate with DynamoDB Streams. Refer to
https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Streams.html for how DynamoDB Streamworks.
Option C is incorrect: Although CloudWatch Events can filter an event from the DynamoDB API call, DynamoDB Stream cannot be set up as a source. The option does not match the requirements of the question.
Option D is incorrect: Because the S3 bucket cannot pull or process events from DynamoDB Stream.