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Re: BUG #2308: pg_dump -a does not respect referential dependencies

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: "Matthew George" <georgema(at)corp(dot)earthlink(dot)net>
Cc: pgsql-bugs(at)postgresql(dot)org
Subject: Re: BUG #2308: pg_dump -a does not respect referential dependencies
Date: 2006-03-08 21:01:30
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-bugs
"Matthew George" <georgema(at)corp(dot)earthlink(dot)net> writes:
> Since the logic obviously exists within pg_dump already to arrange the data
> in the correct order of reference dependencies, can this be added to the
> code path for `pg_dump -a` as well?

No.  In a data-only restore there may not be *any* ordering that works
--- consider circular dependencies.

The best practice is to do standard schema+data dumps, wherein the
ordering problem can be handled properly by not creating the FK
constraints until after the data is loaded.  If you really want to
do a data-only restore, I'd suggest dropping the FK constraints
and re-adding them afterwards (which will be a lot faster than
row-by-row retail checks would be, anyway).

Another possibility is the --disable-triggers option, but I can't
really recommend that, because if there are any referential problems
in the data you load, that way will fail to catch it.

			regards, tom lane

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