SAA-C03 Q414 · Scaling

Question

A company has an application that runs on a single Amazon EC2 instance. The application uses a MySQL database that runs on the same EC2 instance. The company needs a highly available and automatically scalable solution to handle increased traffic. Which solution will meet these requirements?

Accepted Answer

Option C meets every requirement systematically:

**1. High Availability:**
- **Auto Scaling group (ASG)** deploys EC2 instances across multiple Availability Zones. If one AZ goes down, instances in other AZs continue serving traffic.
- **Application Load Balancer (ALB)** distributes traffic across healthy instances and performs health checks.
- **Amazon Aurora Serverless** automatically replicates data across multiple AZs with built-in fault tolerance (6 copies of data across 3 AZs).

**2. Automatic Scalability:**
- **ASG** automatically scales the number of EC2 instances in and out based on demand (scaling policies based on CPU, request count, etc.).
- **Aurora Serverless** automatically scales database capacity up and down based on actual usage — no manual capacity planning needed. This

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🏗️ Architecture

⚙️ Operations

💰 Cost

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