http://www.symfony-project.org/book/trunk/16-Application-Management-Tools#Fixture%20File%20Syntax http://www.symfony-project.org/book/trunk/16-Application-Management-Tools#Launching%20the%20Import http://www.symfony-project.org/book/trunk/16-Application-Management-Tools#Populating%20a%20Database

By default, 'propel-load-data' replaces the existing database content. However, the auto-increment primary key field would be different than fresh loading the data, because the replacement is done by removing all the existing records and adding new ones.

If you also want the auto-increment primary key field to be the same as fresh loading, use the following command beforehand:

symfony propel-insert-sql

BTW, If the last argument call is append, the command will not erase the current data but append them.