http://www.ghostchina.com/how-to-reset-mysqls-root-password/
http://blog.csdn.net/u010603691/article/details/50379282
http://www.ithao123.cn/content-10746582.html
http://www.cnblogs.com/cnblogsfans/archive/2009/09/21/1570942.html
show variables like 'port';
