From: Tom Lane <tgl@sss.pgh.pa.us>
To: Ron Johnson <ronljohnsonjr@gmail.com>
cc: "pgsql-generallists.postgresql.org" <pgsql-general@lists.postgresql.org>
Subject: Re: In-order pg_dump (or in-order COPY TO)
In-reply-to: <CANzqJaCxNP9TjC9WnhaF3F_FKBmL7UXKRiQzoV5nnDS4vmbnxg@mail.gmail.com>
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Comments: In-reply-to Ron Johnson <ronljohnsonjr@gmail.com>
	message dated "Tue, 26 Aug 2025 18:12:52 -0400"
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Date: Tue, 26 Aug 2025 18:23:45 -0400
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Ron Johnson <ronljohnsonjr@gmail.com> writes:
> On Tue, Aug 26, 2025 at 6:08=E2=80=AFPM Tom Lane <tgl@sss.pgh.pa.us> wro=
te:
>> I'd expect pg_dump/pg_restore to preserve the physical row ordering,
>> simply because it doesn't do anything that would change that.

> But the rolling checksums are against a pg_dump file, not a pg_basebacku=
p
> file.

Oh, that wasn't clear to me.

> What probably changed are table OIDs.  Would that change the ordering of
> COPY data in post-restore dump files?

It would not change the order of data within any one table.  There are
corner cases in which different OID assignments can cause pg_dump to
emit database objects in a different order, see this recent thread:

https://www.postgresql.org/message-id/flat/20250707192654.9e.nmisch%40goog=
le.com

			regards, tom lane