ruby on rails - Staging and production environment on heroku -

i want create staging environment on heroku of existing app. want know 2 things

1) using same database of production or not? if yes either requires settings or not?

2) url's of both staging , production environments change or not?

please don't give links

1. no. 2 different databases.

2. yes different.

staging , production on 2 different hosts, 2 different databases, 2 different url's.