PostgreSQL vs. MySQL vs. Commercial Databases: It's All About What You Need
http://www.devx.com/dbzone/Article/20743/0/page/1

Conrad, Tim
DevX.com
2004

Abstract:

Can you trust the leading open-source database engines, PostgreSQL and MySQL, to deliver the performance and features that the Oracles, SQL Servers, and DB2s of the world do? Not just yet, but they could offer enough to meet your needs. Find out how they stack up against each other, as well as against the commercial alternatives.