I guess Jeremy never said it explicitly but I (and probably lots of others) assumed Yahoo Finance used MySQL in the delivery of data, but it’s only used in the back-office which is a lot different!
Where I work, Tradesignals.com, uses MySQL to store our market data and it’s obviously used to deliver data. Then again, the Futures stock market is a lot smaller than the range of data Yahoo offers. While I can’t reveal how much data we go through, American futures trading generate a lot of information!
