| From: | Julien Rouhaud <rjuju123(at)gmail(dot)com> |
|---|---|
| To: | Fujii Masao <masao(dot)fujii(at)oss(dot)nttdata(dot)com> |
| Cc: | Justin Pryzby <pryzby(at)telsasoft(dot)com>, Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>, Peter Geoghegan <pg(at)bowt(dot)ie>, "Tharakan, Robins" <tharar(at)amazon(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: track_planning causing performance regression |
| Date: | 2021-07-07 09:09:21 |
| Message-ID: | CAOBaU_ZxTGMapnWTCGaEiAHochUjzEB5XQN3hqbuf0xspDwSbg@mail.gmail.com |
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On Thu, Jul 1, 2021 at 4:28 PM Fujii Masao <masao(dot)fujii(at)oss(dot)nttdata(dot)com> wrote:
>
> I'm fine with this. So what about the following diff? I added <structname> tag.
>
> <varname>pg_stat_statements.track_planning</varname> controls whether
> planning operations and duration are tracked by the module.
> Enabling this parameter may incur a noticeable performance penalty,
> - especially when a fewer kinds of queries are executed on many
> - concurrent connections.
> + especially when statements with identical query structure are executed
> + by many concurrent connections which compete to update a small number of
> + <structname>pg_stat_statements</structname> entries.
> The default value is <literal>off</literal>.
> Only superusers can change this setting.
It seems perfect, thanks!
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