A method for updating a database schema may include maintaining a database, database schema and a first version of an application. The method may include generating application schema for the first version of the application, the application schema including a mapping of one or more classes of the application to a respective table in the database. The method may include executing the first version of the application and storing an application data object in the database in accordance with the application schema. While the first version of the application is executing, the method may include receiving a request to update the first version of the application to a different version, identifying application metadata for the different version of the application, comparing the application metadata for the different version of the application with the database schema for the database, and updating the database schema based on the comparison.