Kris from KI breaks down the licensing confusion around MySQL. Very interesting. Although I've been working with PostgreSQL for a long time and pretty much ignore MySQL. Not only because of the strange licensing stories surrounding it, but also because of its rather limited features. By the way, replication is now also available natively for PostgreSQL - the corresponding project was just released as an open source version last year (it was previously a commercial product - P1331). At Die wunderbare Welt von Isotopp you can find the original article.