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I got the above error message running Heroku Postgres Basic ( as per this question ) and have been trying to diagnose the problem. One of the suggestions is to use connection pooling but it seems Rails has this built in . Another suggestion is that the app is configured improperly and opens too many connections. My app manages all it's connections through Active Record, and I had one direct connection to the database from Navicat (or at least I thought I had). How would I debug this? RESOLUTION Turns out it was an Heroku issue. From Heroku support: We've detected an issue on the server running your Basic database. While we pinpoint this and address it, we would recommend you provision a new Basic database and migrate over with PGBackups as detailed here: https://devcenter.heroku.com/articles/upgrade-heroku-postgres-with-pgbackups . That should put your database on a new server. I apologize for this disruption – we're working to fix this issue and prevent it from occurring in the future.

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