Domain 2.4: Reliability — AWS SAP-C02 Practice Question 37

How to approach this question

Look for the service that provides durable buffering (queueing).

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B.Modify the web tier to send orders to an Amazon SQS queue. Use an Auto Scaling group of worker EC2 instances to read from the queue and write to RDS.✓ Correct

Amazon SQS provides durable, decoupled queueing. It absorbs spikes in traffic, allowing backend workers to process messages at a controlled rate without overwhelming the database.

Common mistakes

Choosing ElastiCache for write buffering, which risks data loss if the cache fails.

An e-commerce application processes orders. Currently, the web tier writes orders directly to an RDS database. During flash sales, the database is overwhelmed and drops connections, resulting in lost orders. How can the architect decouple this architecture to ensure no orders are lost?

How to approach this question

Full Answer

Common mistakes

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