SAA-C03 Q620 · Cost

Question

A website uses EC2 instances with Auto Scaling and EFS. How can the company optimize costs?

Accepted Answer

**Option C: Use a target tracking scaling policy** is the correct answer because it directly addresses cost optimization through intelligent, demand-based scaling.

**Step-by-step reasoning:**

1. **Problem**: The company has EC2 instances with Auto Scaling and EFS, and wants to optimize costs. This implies they may be over-provisioned or not scaling efficiently.

2. **Target tracking scaling** works like a thermostat — you set a target metric (e.g., average CPU utilization at 50%), and Auto Scaling automatically adjusts the number of instances to maintain that target.

3. **Cost optimization mechanism**: Target tracking ensures you have exactly the right number of instances at any given time. When demand drops, instances are terminated. When demand rises, instances are added. You pay only

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📘 Key Concepts

🏗️ Architecture

⚙️ Operations

💰 Cost

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