Oracle Cloud Infrastructure 2022 Architect Professional — Question 37

A retail company runs their online shopping platform entirely on Oracle Cloud Infrastructure (OCI). This is a 3-tier web application that includes a 100 Mbps Load Balancer, Virtual Machine Instances for web and application tiers, and an Oracle DB Systems Virtual Machine. Due to unprecedented growth, they noticed an increase in the incoming traffic to their website and all users start getting 503 (Service Unavailable) errors.
What is the potential problem in this scenario?

Answer options

• A. The Traffic Management Policy is not set to Load Balance the traffic to the web servers.
• B. The Database is down hence users cannot access the website.
• C. You did not configure a Service Gateway to allow connection between web servers and Load Balancer.
• D. The Load Balancer health check status indicates critical situation for half of the backend web servers.
• E. All the web servers are too busy and not able to answer any request from users.

Correct answer: E

Explanation

The correct answer is E because if all the web servers are too busy, they cannot process incoming requests, leading to 503 errors. Option A is incorrect as it pertains to traffic management, which is not indicated as the issue. Option B is wrong because the database's status is not mentioned as a problem. Option C is not relevant here since the connection between web servers and Load Balancer is not stated as the cause of the 503 errors. Option D suggests a health issue with some servers, but it does not account for the overall inability to serve requests.