harryh mentioned it here: http://news.ycombinator.com/item?id=1769909 http://news.ycombinator.com/item?id=1769909 Computing the badges online (ie at each checki

harryh mentioned it here: http://news.ycombinator.com/item?id=1769909 http://news.ycombinator.com/item?id=1769909 Computing the badges online (ie at each checkin time) requires having the whole db in ram for acceptable performance.