Create 通过分区（Partition）提升MySQL性能

http://www.lampblog.net/2010/08/%E9%80%9A%E8%BF%87%E5%88%86%E5%8C%BA%EF%BC%88partition%EF%BC%89%E6%8F%90%E5%8D%87mysql%E6%80%A7%E8%83%BD/