While MySQL looks real good when you're the only one beating on it, as soon as you get a heavy parallel load you are going to have issues.
Tim Perdue, the creator of PHPBuilder and one of the architects for Source Forge published an article on why he switched PHPBuilder over to Postgresql from MySQL here.
It's a good read. Lotsa good feedback, and more importantly, it's not some arbitrary benchmark in some lab, it's real data on a real server, and Postgresql saved his bacon.
I use postgresql every day, and it NEVER crashes, no matter how high the load.
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