AWS Certified Solutions Architect - Associate
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A meteorological startup company has a custom web application to sell weather data to its users online. The company uses Amazon DynamoDB to store its data and wants to build a new service that sends an alert to the managers of four internal teams every time a new weather event is recorded. The company does not want this new service to affect the performance of the current application.
What should a solutions architect do to meet these requirements with the LEAST amount of operational overhead?
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UAnonymous
A
Use DynamoDB transactions to write new event data to the table. Configure the transactions to notify internal teams.
B
Have the current application publish a message to four Amazon Simple Notification Service (Amazon SNS) topics. Have each team subscribe to one topic.
C
Enable Amazon DynamoDB Streams on the table. Use triggers to write to a single Amazon Simple Notification Service (Amazon SNS) topic to which the teams can subscribe.
D
Add a custom attribute to each record to flag new items. Write a cron job that scans the table every minute for items that are new and notifies an Amazon Simple Queue Service (Amazon SQS) queue to which the teams can subscribe.
Explanation:
Explanation
Option C is the correct answer because it provides the least operational overhead while meeting all requirements:
- DynamoDB Streams captures item-level modifications (INSERT, UPDATE, DELETE) in near real-time without affecting the performance of the main application.
- Triggers (typically using AWS Lambda) can process stream records and publish notifications to an SNS topic.
- Single SNS topic with multiple subscriptions allows all four teams to receive the same alert efficiently.
- No changes to the current application - the solution works asynchronously and independently.
- Minimal operational overhead - DynamoDB Streams and Lambda triggers are fully managed services.
Why other options are incorrect:
- Option A: DynamoDB transactions are for ACID compliance, not for notifications. This would add complexity and potential performance impact to the main application.
- Option B: Requires modifying the current application to publish to SNS, which could affect performance and adds operational complexity.
- Option D: Cron job scanning every minute is inefficient, adds latency, consumes read capacity, and requires manual infrastructure management.
Key AWS Services Used:
- DynamoDB Streams: Captures changes to DynamoDB tables
- AWS Lambda: Processes stream events (triggers)
- Amazon SNS: Fan-out notifications to multiple subscribers
This solution ensures alerts are sent in near real-time without impacting the existing application's performance.
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