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From: Justin Pryzby <pryzby@telsasoft.com>
To: Fujii Masao <masao.fujii@oss.nttdata.com>
Cc: Pavel Stehule <pavel.stehule@gmail.com>
Cc: Peter Geoghegan <pg@bowt.ie>
Cc: Julien Rouhaud <rjuju123@gmail.com>
Cc: Tharakan, Robins <tharar@amazon.com>
Cc: pgsql-hackers@postgresql.org
Subject: Re: track_planning causing performance regression
Date: Wed, 21 Apr 2021 10:40:07 -0500
Message-ID: <20210421154007.GU7256@telsasoft.com> (raw)
In-Reply-To: <f2aa2d6a-3b78-0526-4ca5-8ace10eb745e@oss.nttdata.com>
References: <CAH2-WzmYXtaeCtTEmU_37Eiu5AuRM3etinKFKo=posnLtcxe3g@mail.gmail.com>
	<bc8125cb-264e-5a48-7d1f-17b84df831ed@oss.nttdata.com>
	<CAFj8pRC9Jxa8r5i0TNBWLb8mzuaYzEoLq3QOvip0jVpHPOLbVA@mail.gmail.com>
	<646e5cae-5e8b-feaa-43dc-014bf355bf08@oss.nttdata.com>
	<20210418233615.GB7256@telsasoft.com>
	<d4cb31e2-d43f-0811-8f10-cf8e2f052e5e@oss.nttdata.com>
	<20210419145545.GF7256@telsasoft.com>
	<b86e33bf-d549-db6b-f50b-3cb077807a71@oss.nttdata.com>
	<20210421145338.GT7256@telsasoft.com>
	<f2aa2d6a-3b78-0526-4ca5-8ace10eb745e@oss.nttdata.com>

On Thu, Apr 22, 2021 at 12:13:17AM +0900, Fujii Masao wrote:
> On 2021/04/21 23:53, Justin Pryzby wrote:
> > Or:
> > 
> >         Enabling this parameter may incur a noticeable performance penalty,
> >         especially similar queries are executed by many concurrent connections
> >         and compete to update a small number of pg_stat_statements entries.
> 
> I prefer this. But what about using "identical" instead of "similar"
> because pg_stat_statements docs already uses "identical" in some places?

I also missed "when", again...

> >         Enabling this parameter may incur a noticeable performance penalty,
> >         especially when queries with identical structure are executed by many concurrent connections
> >         which compete to update a small number of pg_stat_statements entries.





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