SAA-C03 Q487 · Scaling

Question

A company hosts a website analytics application on a single Amazon EC2 On-Demand Instance. The analytics application is highly resilient and is designed to run in stateless mode. The company notices that the application is showing signs of performance degradation during busy times and is presenting 5xx errors. The company needs to make the application scale seamlessly. Which solution will meet these requirements MOST cost-effectively?

Accepted Answer

Option D meets all requirements:

1. **Seamless scaling**: An Auto Scaling group automatically adds or removes EC2 instances based on demand. During busy times, more instances are launched; during quiet times, they're terminated. This directly addresses the 5xx errors during peak load.

2. **Stateless design leveraged**: The application is explicitly described as stateless and resilient, which means it's a perfect candidate for Spot Instances. Spot Instances can be interrupted with 2 minutes notice, but stateless apps can tolerate this because no session data is lost.

3. **Cost-effectiveness**: Spot Instances offer up to 90% discount compared to On-Demand pricing. Combined with Auto Scaling (pay only for what you need), this is the most cost-effective option.

4. **AMI + Launch Template**

📖 Explanation

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📘 Key Concepts

🏗️ Architecture

⚙️ Operations

💰 Cost

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