Second, if direct spending on subscriptions or services surrounding the open source database market industry is to pass $1B, which vendors will account for this figure? Well, clearly we'd start with MySQL. I used the 2005-2007 estimates for MySQL's revenue found on Matt Aslet's excellent post regarding MySQL revenue. For 2008 I used a 50 percent growth rate, which is in line with the 55 percent growth in billings (not revenue) of the "MySQL/Infrastructure" reporting category that Sun provides. I tried three different estimates: using a 40 percent annual growth rate that Gartner suggests, tempering growth down by 5 percent each year from 50 percent to 25 percent and using a flat 30 percent growth each year.