>>I processed several million transactions
Transactions scanned is very different from inputting, searching, reporting on handling millions of names & addresses, contacts, dates, times, tracking input, .....................
A dedicated Unix box (s), Oracle / IBM / Teradata / database system that is scalable so when the numbers rise the system copes.
Not cheap but cheaper than IT failure.
20 years ago the SQA(Scottish Exam body) tried to change their computer system on the cheap £2 or 3 million IIRC - it blew up in their face, kids futures, University entry etc at stake .......it cost £36 million for the rescue work.
SQA bought 2 Unix boxes - the first blew up when their IT department connected it to a 3 phase supply instead of a 13 amp plug!
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