Setting HEROKU_POSTGRESQL_BRONZE vars and restarting example-app. You can share a single Heroku Postgres database between multiple apps with the heroku addons:attach command: $ heroku addons:attach my-originating-app::DATABASE -app example-appĪttaching postgresql-addon-name to example-app. Sharing Heroku Postgres Between Applications Common use cases include leader-follower high-availability setups or as part of the database upgrade process. ![]() ![]() For apps with a single database, its URL is automatically assigned to this config var.įor apps with multiple Postgres databases, set the primary database with heroku pg:promote. ![]() The DATABASE_URL config var designates the URL of an app’s primary Heroku Postgres database. For more information about how to set up Heroku Postgres to run in your local environment, see Local Setup for Heroku Postgres. Heroku recommends running Postgres locally to ensure parity between environments. Provisioning Heroku Postgresįor more information about how to provision a Heroku Postgres database, see Provisioning Heroku Postgres. If your app’s requirements eventually outgrow the resources provided by the initial plan you select, you can easily upgrade your database. Pricing information for Heroku Postgres plans is available on the Heroku Postgres add-on page. For more information on what each plan provides, see Choosing the Right Heroku Postgres Plan. Heroku Postgres offers a variety of plans, spread across different tiers of service: Essential, Standard, Premium, Private, and Shield. In addition to a variety of Heroku CLI commands to manage your database, Heroku Postgres provides a web dashboard, dataclips to share queries, and several other helpful features. You can access a Heroku Postgres database from any language with a PostgreSQL driver, including all languages officially supported by Heroku. Heroku Postgres is a managed SQL database service provided directly by Heroku. Sharing Heroku Postgres Between Applications.Run your application against the new PostgreSQL database to identify and resolve any common errors. On some production hardware, pgloader reaches a hard limit of 6 MB per second, which is bottlenecked by the CPU. On older hardware, a migration rate of approximately 3 million rows per minute is common. pgloader includes a bytes metric in its default report to help you estimate the migration’s progress. Migration time depends on the size and nature of your database. See the usage section of the README or the pgloader quick start for more details. Migrate dataĬreate a Postgres database and use the CLI to migrate your MySQL data to it with pgloader: createdb pgdbname Install pgloader by following the instructions in the project README. ![]() The pgloader project is the most mature utility for converting databases from MySQL to Postgres. The Heroku Postgres docs have instructions for installing PostgreSQL locally. To ensure dev/prod parity, run your application in development with PostgreSQL first. Follow these steps to switch from MySQL to PostgreSQL: Run PostgreSQL locally Most applications that use an ORM library to access their database can easily switch to a PostgreSQL database. See your chosen add-on’s documentation for provisioning instructions, as they vary by provider. If your application uses MySQL-specific features, there are a number of MySQL providers in the Heroku Add-ons marketplace you can use instead of Heroku Postgres. Although Heroku Postgres is the recommended relational database for Heroku apps because of its tight integration with the platform, there are options for applications that currently run on MySQL. MySQL is a popular relational database maintained by Oracle.
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