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From: Fujii Masao <masao.fujii@oss.nttdata.com>
To: Justin Pryzby <pryzby@telsasoft.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: Thu, 22 Apr 2021 00:13:17 +0900
Message-ID: <f2aa2d6a-3b78-0526-4ca5-8ace10eb745e@oss.nttdata.com> (raw)
In-Reply-To: <20210421145338.GT7256@telsasoft.com>
References: <CAH2-WznCT6rZYGYE_Zxf1oYDZVMyXqm+SWRx+R2b5-DX11pmpQ@mail.gmail.com>
	<42a13b4c-e60c-c6e7-3475-8eff8050bed4@oss.nttdata.com>
	<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>



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?

Regards,

-- 
Fujii Masao
Advanced Computing Technology Center
Research and Development Headquarters
NTT DATA CORPORATION





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