You have a database that is running on a large instance type. From a monitoring perspective, it seems that the packets are getting lost, and the instance is not delivering requests as desired. Initially, a test was done to check the capacity of the server. At that time, the database server was able to take on the load. What could be the issue at this point?

Answer options:

A.The right AMI was not chosen for the underlying instance.
B.The instance was using accumulated network credits during the testing phase.
C.There are internal database errors that are causing the timeouts.
D.The instance is not using a VPN tunnel for communication.

Answer – C
The most probable reason, in this case, is that now the database is not performing under the load and hence is giving TCP errors.
Option A is invalid because the AMI will not be the issue.
Option B is invalid because the Instance will still get the network credits during normal operations time.
Option D is invalid because the mode of transport is not given in the question.
For more information on troubleshooting databases on AWS, please visit the following URL:
https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/CHAP_Troubleshooting.html