Score -1: Flamebait, heh :)

Anyway, why not keep using the flatfile? If it is a read-only small data store, just keep using that, with proper file locks. Or maybe use a BerkeleyDB tied hash. I'm sure there are other options to look at as well...

Again, I don't know exactly what the requirements are, but what I am pointing out is that an SQL engine can be overkill sometimes.