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?
A 503 Service Unavailable error generally indicates that the server is temporarily unable to handle the request due to overload or maintenance. Given the scenario of increased incoming traffic and the setup of a 3-tier web application, it is most likely that all the web servers are too busy and not able to answer any request from users. This would result in such an error being returned to the users.
Answer is E: A 503 Service Unavailable Error is an HTTP response status code indicating that a server is temporarily unable to handle the request. This may be due to the server being overloaded or down for maintenance.