Horton

Re: doc: explain pgstatindex fragmentation

Frédéric Yhuel <frederic.yhuel@dalibo.com>

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From: Frédéric Yhuel <frederic.yhuel@dalibo.com>
To: Laurenz Albe <laurenz.albe@cybertec.at>, Bertrand Drouvot <bertranddrouvot.pg@gmail.com>
Cc: PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>, Benoit Lobréau <benoit.lobreau@dalibo.com>
Date: 2025-01-24T14:41:46Z
Lists: pgsql-hackers

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  1. doc: explain pgstatindex fragmentation

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On 1/24/25 14:58, Laurenz Albe wrote:
> 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).
>>

Damn! I missed that one too...

>> 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.
>

It looks good to me (apart from the typo). v4 attached

Thanks! :-)