I use Sql Server as part of my setup, but I see a lot of negative reactions on ET about using this or other SQL databases. My use is for stat-arb, and I analyze (intraday) several hundred thousand possible pairs, with thousands of datapoints per pair...but I don't trade on millisecond timescales, so I can't comment on that from personal experience. I'm happy overall with the performance for any basis longer than a few seconds though. I run my analysis in a continuous loop that takes about 3 minutes per cycle. So who else uses SQL? Who's tried it and hates it? And why?