Discuss Amazon SAA-C03 Exam Topic 1 Question 18

A company has an application that processes customer orders. The company hosts the application on an Amazon EC2 instance that saves the orders to an Amazon Aurora database. Occasionally when traffic is high: the workload does not process orders fast enough.

What should a solutions architect do to write the orders reliably to the database as quickly as possible?

AIncrease the instance size of the EC2 instance when traffic is high. Write orders to Amazon Simple Notification Service (Amazon SNS). Subscribe the database endpoint to the SNS topic.

BWrite orders to an Amazon Simple Queue Service (Amazon SQS) queue. Use EC2 instances in an Auto Scaling group behind an Application Load Balancer to read from the SQS queue and process orders into the database.

CWrite orders to Amazon Simple Notification Service (Amazon SNS) Subscribe the database endpoint to the SNS topic Use EC2 instances in an Auto Scaling group behind an Application Load Balancer to read from the SNS topic.

DWrite orders to an Amazon Simple Queue Service (Amazon SQS) queue when the EC2 instance reaches CPU threshold limits. Use scheduled scaling of EC2 instances in an Auto Scaling group behind an Application Load Balancer to read from the SQS queue and process orders into the database

Suggested Answer: B

Amazon SQS is a fully managed message queuing service that can decouple and scale microservices, distributed systems, and serverless applications. By writing orders to an SQS queue, the application can handle spikes in traffic without losing any orders. The EC2 instances in an Auto Scaling group can read from the SQS queue and process orders into the database at a steady pace. The Application Load Balancer can distribute the load across the EC2 instances and provide health checks. This solution meets all the requirements of the question, while the other options do not. Reference:

https://docs.aws.amazon.com/wellarchitected/latest/reliability-pillar/welcome.html

https://aws.amazon.com/architecture/serverless/

https://aws.amazon.com/sqs/

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13 comments · newest first

Vernice 11 months ago

D sounds complicated, not sure if it’s worth the effort.

Amina 12 months ago

Definitely going with B, SQS is perfect for decoupling!

Cheryl 12 months ago

A bit surprised that SNS is even mentioned here, it’s not ideal for order processing.

Cristy 1 year ago

I disagree, I think D could work just as well.

Deja 1 year ago

Option B seems like the best choice for handling high traffic efficiently.

Susana 1 year ago

I feel like option D might be overcomplicating things with the scheduled scaling. I’d lean towards B for simplicity and reliability.

Reiko 1 year ago

I’m a bit confused about the difference between SNS and SQS in this context. I thought SNS was more for notifications, but maybe it could work?

Adell 1 year ago

I think option B sounds familiar from our practice questions. It seems like a solid approach to handle high traffic by using an Auto Scaling group.

Fallon 1 year ago

I remember we discussed using SQS for decoupling the order processing from the EC2 instance, but I'm not sure if it's the best option here.

Marsha 1 year ago

This seems like a straightforward question about user account management in Activiti. I'll need to think through the different options carefully, but I'm confident I can figure this out.

Temeka 1 year ago

I've got a good strategy here - I'll carefully read each option and eliminate the ones that don't seem right.

Lindsey 1 year ago

I'm pretty confident I know the right commands to use here. I'll give it a try and see if I can get the alert to trigger.

Alpha 1 year ago

I'm pretty confident I know the answer to this one. Creating an index is usually done with a specific SQL statement, so I'll carefully read through the options.

Amazon SAA-C03 Exam - Topic 1 Question 18 Discussion