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I want to do a final pg_dumpall on a server, then copy the output to a different server and restore the db there.

How can I avoid modification to the database during pg_dumpall?

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From the pg_dump documentation :

It makes consistent backups even if the database is being used concurrently.

So the backup process takes a snapshot of the DB on a specific moment so each commits which are made during the process are ignored.

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