This information was valid at the time this article was written (liberty-2).
At the OpenStack Operators meetup in Palo Alto, people complained about how database migration commands were inconsistent across projects. Here is a list of those commands so you can get an idea of the inconsistent people are talking about:
|Cinder||cinder-manage db sync|
|Neutron||neutron-db-manage upgrade head|
|Nova||nova-manage db sync|