Why do I see "COPY public.table_name (id,...) TO stdout" in my Postgres logs?

Issue

You've noticed some COPY commands being issued to your database in the Postgres logs

Resolution

These are likely being issued by PG Backups, either through manual or scheduled backups. You can check the timestamp seen on the log entry against the backups timestamp to see if they correlate.

heroku pg:backups -a app-name will list all backups.

You can also check the timing of your scheduled backups with heroku pg:backups:schedules -a app-name

Depending how quickly the COPY completed you may not queries for all tables. Heroku Postgres Logs show queries that take longer than 2 seconds: https://devcenter.heroku.com/articles/postgres-logs-errors#log-duration-3-565-s

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