Google Cloud Associate Cloud Engineer — Question 46

You are deploying an application to App Engine. You want the number of instances to scale based on request rate. You need at least 3 unoccupied instances at all times. Which scaling type should you use?

Answer options

• A. Manual Scaling with 3 instances.
• B. Basic Scaling with min_instances set to 3.
• C. Basic Scaling with max_instances set to 3.
• D. Automatic Scaling with min_idle_instances set to 3.

Correct answer: D

Explanation

The correct answer is D because Automatic Scaling with min_idle_instances set to 3 ensures that there are always at least 3 unoccupied instances ready to handle incoming requests. Options A and B do not provide automatic scaling based on request rate, and option C limits the maximum instances instead of ensuring idle instances.