Re: Is there a way to know write statistics on an individual index

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От higherone
Тема Re: Is there a way to know write statistics on an individual index
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Msg-id CAPgEv8fhh-knJOSACN8G=ngWKkHSh-Eg0CS5RX-ZbxJ87tTSPA@mail.gmail.com
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Ответ на Re: Is there a way to know write statistics on an individual index  (Maciek Sakrejda <m.sakrejda@gmail.com>)
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It's not a partial index, but I believe the pg_stat_user_tables contains all the writes on the table, which not necessarily updates the individual index I'm interested in (e.g. when the updated column is not part of the index columns) .


On Fri, Dec 9, 2022 at 2:06 PM Maciek Sakrejda <m.sakrejda@gmail.com> wrote:
On Thu, Dec 8, 2022 at 2:53 AM David Rowley <dgrowleyml@gmail.com> wrote:
>
> On Thu, 8 Dec 2022 at 19:59, higherone <higherone@gmail.com> wrote:
> > I know there's a pg_stats_user_indexes that gives statistics about the index scans/fetches, but I don't find any information about how many writes(insert/update/delete) happen on this individual index.
> > Is there some tool that could achieve this?
>
> Is this a partial index? If not, those should just increase at the
> same rate that's mentioned in pg_stat_user_tables for the table that
> the index belongs to.

Well, not deletes, right? And HOT updates won't affect indexes either,
so they should be subtracted from n_tup_upd.

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