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From: Laurenz Albe <[email protected]>
To: Ron Johnson <[email protected]>
Cc: Durgamahesh Manne <[email protected]>
Cc: pgsql-general <[email protected]>
Subject: Re: Regarding fillfactor use case for only delete ops
Date: Sat, 07 Jun 2025 13:53:14 +0200
Message-ID: <[email protected]> (raw)
In-Reply-To: <CANzqJaB8aRCuEYYDU_qK0WUVVdWdoCte=wDt5387uj=Ncw5_Pg@mail.gmail.com>
References: <CAJCZkoLkMLsz1raz+XLJ09PUdgWv7mw37+zaFw9jNMhFUC+SVg@mail.gmail.com>
	<[email protected]>
	<CANzqJaB8aRCuEYYDU_qK0WUVVdWdoCte=wDt5387uj=Ncw5_Pg@mail.gmail.com>

On Fri, 2025-06-06 at 09:59 -0400, Ron Johnson wrote:
> On Fri, Jun 6, 2025 at 8:57 AM Laurenz Albe <[email protected]> wrote:
> > On Fri, 2025-06-06 at 14:10 +0530, Durgamahesh Manne wrote:
> > > Can we generate a fill factor for tables that have delete ops ?
> > > 
> > > Does the fill factor really work and help to minimize the bloat for tables that have delete ops?
> > > 
> > > I have parent table with weekly partitions So for every week 50 to 60 gb of bloat generates and autovacuum params already in place for child tables 
> > 
> > Nothing can ever avoid bloat caused by DELETE, except partitioning in a
> > way that you can drop a partition rather than running DELETE.
> 
> Isn't the fill factor aimed at reducing bloat during updates of HOT tables?

Yes, but not during DELETEs.

HOT updates also don't directly avoid bloat on tables; only on indexes.
They reduce the bloat on tables inderectly, because the dead tuples can
be cleaned up with less effort.

Yours,
Laurenz Albe

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