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Re: Fillfactor effectiveness on existing table - Mailing list pgsql-general

From Durgamahesh Manne
Subject Re: Fillfactor effectiveness on existing table
Date
Msg-id CAJCZko+HNA++sW-a0cZWmPn7gPNDy2HKGXMSshMb5TFPzC5Qjw@mail.gmail.com
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In response to Re: Fillfactor effectiveness on existing table  (Laurenz Albe <laurenz.albe@cybertec.at>)
Responses Re: Fillfactor effectiveness on existing table
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On Wed, 11 Feb, 2026, 00:01 Laurenz Albe, <laurenz.albe@cybertec.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 
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

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