Re: pg_dump versus hash partitioning

On Tue, Feb 14, 2023 at 2:21 PM Tom Lane <tgl@sss.pgh.pa.us> wrote:
> This made me wonder if this could be a usable solution at all, but
> after thinking for awhile, I don't see how the claim about foreign key
> constraints is anything but FUD.  pg_dump/pg_restore have sufficient
> dependency logic to prevent that from happening.  I think we can just
> drop the "or perhaps ..." clause here, and tolerate the possible
> inefficiency as better than failing.

Right, but isn't that dependency logic based around the fact that the
inserts are targeting the original partition? Like, suppose partition
A has a foreign key that is not present on partition B. A row that is
originally in partition B gets rerouted into partition A. It must now
satisfy the foreign key constraint when, previously, that was
unnecessary.

--
Robert Haas
EDB: http://www.enterprisedb.com