Paradigma Software released Valentina Community Server, a free
database server based on the extremely fast database technology. In
performance comparisons on complex queries, typical speed over mySQL
is anywhere between x5 to x10 as fast. You can build solutions around
Valentina Community Server using PHP 4 or 5, with Ruby on Rails
support on its way.

http://www.valentina-db.com/en/produ...siness/VSRVCMN