SAA-C03 Q564 · Serverless

Question

A company runs an application that stores and shares photos. Users upload the photos to an Amazon S3 bucket. Every day, users upload approximately 150 photos. The company wants to design a solution that creates a thumbnail of each new photo and stores the thumbnail in a second S3 bucket. Which solution will meet these requirements MOST cost-effectively?

Accepted Answer

This answer perfectly addresses every requirement:

1. **Event-driven trigger**: S3 event notifications fire automatically when a new object (photo) is uploaded — no polling needed. This is the native, purpose-built mechanism for reacting to S3 object creation.

2. **AWS Lambda for processing**: Lambda is ideal for short-lived, sporadic workloads. With ~150 photos/day, that's roughly 150 Lambda invocations per day. Each thumbnail generation likely takes seconds and requires minimal memory. Lambda charges only for actual execution time (per-ms billing), making it extremely cost-effective for low-volume, bursty workloads.

3. **No infrastructure to manage**: No servers, clusters, or always-on instances. Zero cost when no photos are being uploaded.

4. **Real-time processing**: Thumbnails are

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