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

http://bazaar.launchpad.net/~mysqlatfacebook/mysqlatfacebook/tools/annotate/head:/osc/OnlineSchemaChange.php

mysql_online_schema_change工具大集合