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From: Nathan Bossart <nathandbossart@gmail.com>
To: Hannu Krosing <hannuk@google.com>
Cc: Tom Lane <tgl@sss.pgh.pa.us>
Cc: PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>
Subject: Re: Horribly slow pg_upgrade performance with many Large Objects
Date: Wed, 9 Apr 2025 12:17:32 -0500
Message-ID: <Z_arrB_gbpUSpFKW@nathan> (raw)
In-Reply-To: <CAMT0RQQFZHZvftObnG9OAHE=bOhuVA_ymp6pG+dLfS66o-EGNA@mail.gmail.com>
References: <Z_VE4Q4A2nNCX3Ny@nathan>
	<4044567.1744128814@sss.pgh.pa.us>
	<CAMT0RQSALxZ2DJbq0b5cy+cvmpVxkawmv7c+qTWYObubZVr+2g@mail.gmail.com>
	<4047312.1744130263@sss.pgh.pa.us>
	<Z_VTucTiS01p-d6z@nathan>
	<4050387.1744132029@sss.pgh.pa.us>
	<Z_VbON4DZn0wPvUN@nathan>
	<4054965.1744134140@sss.pgh.pa.us>
	<Z_VtcQxi_i78-yjg@nathan>
	<CAMT0RQQFZHZvftObnG9OAHE=bOhuVA_ymp6pG+dLfS66o-EGNA@mail.gmail.com>

On Tue, Apr 08, 2025 at 09:41:06PM +0200, Hannu Krosing wrote:
> On Tue, Apr 8, 2025 at 8:39 PM Nathan Bossart <nathandbossart@gmail.com> wrote:
>> I've also verified that the dependency information is carried over in
>> upgrades to later versions (AFAICT all the supported ones).
> 
> If I remember correctly the change to not copying
> pg_largeobject_metadata data file but instead moving LOs as part of
> schema was done in v12 when oid,, which had been a system column in
> v11, became a user column, so upgrade to v11 is likely also missing
> the dependencies

Right.

-- 
nathan





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