DB command
Create DB
$ rake db:create
Drop DB
$ rake db:drop
Create DB table according to migrate file
$ rake db:migrate
Create a db/schema.rb file that can be portably used against any DB supported by AR
$ rake db:schema:dump
Load a schema.rb file into the database
$ rake db:schema:load
Reset db according to db\schema.rb, delete -> new again
$ rake db:reset