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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: Wed, 21 Apr 2021 23:38:52 +0900
Message-ID: <b86e33bf-d549-db6b-f50b-3cb077807a71@oss.nttdata.com> (raw)
In-Reply-To: <20210419145545.GF7256@telsasoft.com>
References: <d4a15deb-8a85-b78c-b447-bc5df7c4a926@oss.nttdata.com>
	<CAH2-WzmVP4ibDDSipQi_BamMrPeB72X8iW0R-T9gA-ZToG=m9g@mail.gmail.com>
	<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>



On 2021/04/19 23:55, Justin Pryzby wrote:
> What does "kind" mean ?  I think it means a "normalized" query or a "query
> structure".
> 
> "a fewer kinds" is wrong, so I think the docs should say "a small number of
> queries" or maybe:

Okay, I agree to update the description.

>>>>       Enabling this parameter may incur a noticeable performance penalty,
>>>>       especially similar queries are run by many concurrent connections and
>>>>       compete to update the same pg_stat_statements entry

"a small number of" is better than "similar" at the above because
"similar" sounds a bit unclear in this case?

It's better to use "entries" rather than "entry" at the above?

Regards,
  

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





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