Re: doc: explain pgstatindex fragmentation

Laurenz Albe <laurenz.albe@cybertec.at>

From: Laurenz Albe <laurenz.albe@cybertec.at>

To: Bertrand Drouvot <bertranddrouvot.pg@gmail.com>, Frédéric Yhuel <frederic.yhuel@dalibo.com>

Cc: PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>, Benoit Lobréau <benoit.lobreau@dalibo.com>

Date: 2025-01-24T13:58:07Z

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doc: explain pgstatindex fragmentation
- 960135114629 19 (unreleased) landed

On Fri, 2025-01-24 at 13:34 +0000, Bertrand Drouvot wrote:
> + Since indexes have a default fillfactor of 90, this should be around 0.9 for
> + newly built indexes
> 
> I think 0.9 should be replaced by 90 (that's the actual kind of output we'd get).
> 
> But having said that, I'm not sure we should mention those 90 stuff because it
> depends of the amount of data indexed (I mean if the index has a very few
> leaf pages, say < 5, then it's easy to be << 90 since it's an average). That's
> probably not the majority of indexes though so maybe just nuance the sentence a
> bit.

Sorry about the 0.9.

Perhaps the wording could be more careful: ... this should be around 90 for
most newly built indexes of non-neglectable size.

Yours,
Laurenz Albe