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From: Ron Johnson <[email protected]>
To: Laurenz Albe <[email protected]>
Cc: Durgamahesh Manne <[email protected]>
Cc: pgsql-general <[email protected]>
Subject: Re: Regarding fillfactor use case for only delete ops
Date: Sat, 7 Jun 2025 14:42:38 -0400
Message-ID: <CANzqJaDxcBCXEw4M2yOSWp4MR6W3mRKade3sj5wHEtb1j+0bQw@mail.gmail.com> (raw)
In-Reply-To: <[email protected]>
References: <CAJCZkoLkMLsz1raz+XLJ09PUdgWv7mw37+zaFw9jNMhFUC+SVg@mail.gmail.com>
	<[email protected]>
	<CANzqJaB8aRCuEYYDU_qK0WUVVdWdoCte=wDt5387uj=Ncw5_Pg@mail.gmail.com>
	<[email protected]>

On Sat, Jun 7, 2025 at 7:53 AM Laurenz Albe <[email protected]>
wrote:

> 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.
>

I still don't understand why OP is deleting from a date-partitioned table,
instead of dropping the oldest partitions.


> 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.
>

Thanks for the clarification.

-- 
Death to <Redacted>, and butter sauce.
Don't boil me, I'm still alive.
<Redacted> lobster!

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