If you distributed your application in binary form (e.g. WAR or JAR) and want to make some changes to the database schema after the initial release, that's where the Runtime Schema Upgrade helps.
See the changes:
MyBatis Migrations is a Java command line tool that keeps track of database schema changes managing DDL files (known as migrations). Allows to query the current status of the database, apply schema changes and also undo them. It also helps to detect and solve concurrent database schema changes made by different developers.
Better watch the video!