At dubizzle, we recently reached a roadblock on a project where we had to change schema on around 130 tables in our production database with master/slave replication. The simplest possible solution that could have been was to recreate same tables with new schemas, copy the data and update our application to point to the new ones. This couldn’t have been made possible without a significant downtime for the whole website which wasn’t acceptable. So, we leveraged Percona Toolkit for MySQL to do the job and we would like to share our learnings in this post.<p><i>Blog post: http://mrafayaleem.com/2016/02/08/live-mysql-schema-changes-with-percona/</i>