Server node, web application as angular and several other things has the mode of development and the production mode, I stopped to think and I appeared that doubt, database also has something like this.
If I'm modifying an application, the insert update and delete that I make in the database to test would not like it to be actually done, but changes to table creation, creating fields etc, I'd like it to stay. It has some database that has such a function or something, or the only solution would be to make a copy of the database to use as a test.