You want your Lambda function to update an aggregate count in DynamoDB every time an item is inserted. Which combination of AWS services and features is best suited for this?

hard📝 Application Q9 of 15

AWS - Serverless Architecture

ALambda polls DynamoDB table every minute to count items.

BUse CloudWatch Events to trigger Lambda to update the count.

CDynamoDB Streams triggers an SNS topic that updates the count.

DDynamoDB Streams triggers Lambda, which updates the count in the same DynamoDB table.

Step-by-Step Solution

Solution:

Step 1: Identify event-driven update method
DynamoDB Streams can trigger Lambda on inserts, enabling real-time processing.
Step 2: Update count efficiently
Lambda can update the aggregate count directly in DynamoDB, ensuring consistency.
Final Answer:
DynamoDB Streams triggers Lambda, which updates the count in the same DynamoDB table. -> Option D
Quick Check:
Streams + Lambda for real-time update = B [OK]

Quick Trick: Use Streams + Lambda for real-time DynamoDB updates [OK]

Common Mistakes:

Polling instead of event-driven
Using SNS unnecessarily
Using CloudWatch Events for table changes

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You want your Lambda function to update an aggregate count in DynamoDB every time an item is inserted. Which combination of AWS services and features is best suited for this?

Step 1: Identify event-driven update method

Step 2: Update count efficiently

Final Answer:

Quick Check:

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