Steve Clark <sclark@netwolves.com> writes:
> does pg_dumpall make consistent backups if the database is being used
> concurrently?
> Even though the man page doesn't say it does.
That's intentional, because it doesn't. What you get is a pg_dump
snapshot of each database in sequence; those snapshots don't all
correspond to the same time instant. There isn't any good way to
guarantee time coherence of dumps across two databases.
regards, tom lane