The option is similar to the previous one, but he is not the same to use something like inheritance or cascade: Yes database_config.common.php where described the model configuration and which versionseries (there is a new feature in the project default settings there committse and crawl on all developers), and ignored VCS database_config.instance.php which are overridden, only the necessary settings. Roughly speaking, the first recorded host, port, user, password, database, prefix, and the second overrides only the user, password, and database or only the host.