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I don't think Oracle is a totally worthless product. I hear that it's good for carrier-grade high-availability. Of course, I've also heard that it's fairly easy to crash it, so hey. I know that my Oracle install stopped working once just because I had added, oh, a fifth database to it. Apparently you have to explicitly tell Oracle (with a very cryptic command that's specific to just your system, because it involves filesystem paths) that you want to have more than about five databases.