When does Heroku Postgres failover?
A database failure or slow response doesn't immediately trigger a database failover in the Heroku PostgreSQL database service. The Heroku PostgreSQL support ensures that the application database really needs a failover (as it involves some cost to switch to a new database instance and shut down the previous one), besides setting up new configuration and making the application live again on the new database. Heroku support runs a suite of tests to confirm that a failover is the only option. The tests are run for a given period of time, usually two minutes, across different application dynos to see a consistency in the database response behavior. Only when it is detected that the database is not responsive for ...
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