http://www.techsiteanalytics.com/index.php/2013/03/01/5012
Percona公司:基于Perl语言
http://www.percona.com/doc/percona-toolkit/2.1/pt-online-schema-change.html
openarkkit:基于python语言
http://openarkkit.googlecode.com/svn/trunk/openarkkit/doc/html/oak-online-alter-table.html
facebook公司:基于PHP的