Your customer is operating a payment processing application on a Windows Server cluster with
the back-end Oracle databases running on Oracle Enterprise Linux (OEL). Both the application
and database environments have been presented storage from the customer’s VNX solution.
Your customer reports less than optimal performance for their online payment processing
application. While utilizing IOSTAT, utlbstat and utlestat, a high load on the buffer cache and I/O
system performance issues are found on the database servers.
What is the most likely problem?

A.
Redo logs are too small

B.
High Amounts of Recursive (SYS) SQL

C.
Long Full Table Scans

D.
Shortage of rollback segments