Re: Fillfactor effectiveness on existing table

On Wed, 11 Feb, 2026, 00:01 Laurenz Albe, <laurenz(dot)albe(at)cybertec(dot)at> wrote:

> On Tue, 2026-02-10 at 21:25 +0530, Durgamahesh Manne wrote:
> > I added fillfactor with less than 100 to existing table then ran vacuum
> full to take effect
> >
> > How to ensure the applied fillfactor is working successfully
> >
> > A ratio of hot updates in catalog table should higher than value of
> n_dead_tup or n_tup_upd? Or what ?
>
> Run
>
> SELECT n_tup_upd, n_tup_hot_upd
> FROM pg_stat_all_tables
> WHERE relname = 'your table';
>
> Then wait for an hour and run the query again.
>
> See how much "n_tup_upd" and "n_tup_hot_upd" increased in that hour.
> If the increase is about the same for both, almost all of your UPDATEs
> are HOT.
>
> Yours,
> Laurenz Albe
>

Hi
@Laurenz Albe <laurenz(dot)albe(at)cybertec(dot)at>
offer=> SELECT relname AS table_name, n_tup_upd AS updates, n_tup_hot_upd
AS hot_updates FROM pg_stat_all_tables WHERE relname = 'market';
table_name | updates | hot_updates
market | 5997455764 | 3752865557

Regards
Durga Mahesh

>