Re: Consistent pg_dump's

Alexey Rodriguez Yakushev <alexey@serinbol.com> writes:
> Let me rephrase the question, i have a web-based application which uses 
> postgres as its backend. It must be operating 24 hours 7 days. If i want to 
> make a backup of the database using pg_dump, wouldn't it be possible that a 
> transaction occurs in the middle of the backup, leaving the backup 
> inconsistent?

No.  pg_dump will produce a consistent snapshot that does not show the
effects of transactions that start (or complete) after the pg_dump
transaction starts.  See the "multi-version concurrency control" chapter
of the User's Guide.

Postgres has its share of problems for 24x7 operation (read about VACUUM
if you haven't yet) ... but producing self-consistent backups is not
one of 'em.

			regards, tom lane