Google's ad business has been (is?) backed by MySQL. http://zurlocker.typepad.com/theopenforce/2005/12/googles_use_of_.html http://zurlocker.typepad.com/theope

Google's ad business has been (is?) backed by MySQL. http://zurlocker.typepad.com/theopenforce/2005/12/googles_use_of_.html http://zurlocker.typepad.com/theopenforce/2005/12/googles_us... http://research.google.com/pubs/pub38125.html http://research.google.com/pubs/pub38125.html