$ heroku plugins:install https://github.com/ddollar/heroku-pg-transfer
$ heroku help pg:transfer
Usage: heroku pg:transfer
transfer data between databases
-f, --from DATABASE # source database, defaults to DATABASE_URL on the app
-t, --to DATABASE # target database, defaults to local $DATABASE_URL
$ env DATABASE_URL=postgres://localhost/myapp-development heroku pg:transfer
Source database: DATABASE on myapp.herokuapp.com
Target database: myapp-development on localhost:5432
pg_dump: reading schemas
pg_dump: reading user-defined tables
...
$ heroku pg:transfer --from charcoal --to postgres://foo
Source database: HEROKU_POSTGRESQL_CHARCOAL on myapp.herokuapp.com
Target database: foo on localhost:5432
pg_dump: reading schemas
pg_dump: reading user-defined tables
...
$ source .env && heroku pg:transfer --from $DATABASE_URL --to charcoal
Source database: myapp-development on localhost:5432
Target database: HEROKU_POSTGRESQL_CHARCOAL on myapp.herokuapp.com
pg_dump: reading schemas
pg_dump: reading user-defined tables
...
# detects non-postgres url
$ heroku pg:transfer --to mysql://foo
! Only PostgreSQL databases can be transferred with this command.
! For information on transferring other database types, see:
! https://devcenter.heroku.com/articles/import-data-heroku-postgres
# if they dont have a local $DATABASE_URL
$ heroku pg:transfer
! No local DATABASE_URL detected and --to not specified.
! For information on using config vars locally, see:
! https://devcenter.heroku.com/articles/config-vars#local_setup