Hi there,
Check out the docs for a lot of good info on how Heroku's DB works:

http://docs.heroku.com/database
http://docs.heroku.com/taps

All Heroku apps use a postgres DB.  Heroku automatically configures  
your app on the fly to make sure it uses the right database.  You need  
to move your own data into the Heroku database - TAPS is a good way to  
do that.

Oren

On Sep 7, 2009, at 10:42 AM, joviyach wrote:

>
> Hello all,
>
> I am relatively new to RoR, but I had been using Heroku Garden and the
> web based editor a bit. I am trying to understand how the moving of a
> locally created database to Heroku works. I understand in general how
> Git works, but how does Heroku "know" that the database for example is
> a MySQL database and not a Postgres database, etc...
>
> Does this read the local database.yml file for this information?
>
> Is it essentially doing the migrate over again on Heroku?
>
> How is any of the existing local data itself then populated?
>
> Thanks in advance for your patience with a newb.
>
>
> >


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