集群和分区：
http://han-zw.iteye.com/blog/1662941
http://www.php-note.com/article/detail/794
分区：
http://lobert.iteye.com/blog/1955841
http://blog.csdn.net/jiao_fuyou/article/details/16801389
http://blog.51yip.com/mysql/1013.html 很好
http://www.cnblogs.com/hustcat/archive/2009/12/24/1631674.html