Will my app experience downtime during the Heroku Postgres maintenance?


You are wondering if your app will experience downtime during the data maintenance.


Any planned maintenance requires some downtime. If you are on a high-availability (HA) plan, you arere already aware as you have taken steps to protect yourself if an outage occurs. If you are not on a HA plan, Heroku attempts to ensure as little downtime as possible for your application. After a maintenance event, HA is unavailable on HA plans while a new HA follower is created and caught up.

During a maintenance downtime, you can see app errors such as sql_error_code = 25006 ERROR: cannot execute INSERT in a read-only transaction, or more general errors that indicate your application cannot connect to the database.

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