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30 lines
964 B
Markdown
30 lines
964 B
Markdown
# Connect To A Database By Color
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All of your PostgreSQL databases in Heroku are given attachment names that use
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a random color. This might be _pink_, _brown_, _cobalt_, etc. And the
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attachment names then look like `HEROKU_POSTGRESQL_PINK`,
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`HEROKU_POSTGRESQL_BROWN`, `HEROKU_POSTGRESQL_COBALT`, etc.
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We can connect to a Heroku-managed PostgreSQL instance from the command-line
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like so:
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```bash
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$ heroku pg:psql --app my-app
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```
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This is going to connect to the _default_ database which is the one with the
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`DATABASE_URL` attachment.
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There are lots of instances where we may have other databases besides the
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primary (e.g. let's say we have a read replica follower). If we want to connect
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to that one, we can do so by _color_.
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If that database's attachment is `HEROKU_POSTGRESQL_IVORY`, then we'd connect
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to it like so:
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```bash
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$ heroku pg:psql ivory --app my-app
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```
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[source](https://devcenter.heroku.com/articles/managing-heroku-postgres-using-cli#pg-psql)
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