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From: Laurenz Albe <laurenz.albe@cybertec.at>
To: Tom Lane <tgl@sss.pgh.pa.us>
To: Peter Geoghegan <pg@bowt.ie>
Cc: Shijia Wei <shijiawei@utexas.edu>
Cc: pgsql-performance@lists.postgresql.org
Subject: Re: Consecutive Query Executions with Increasing Execution Time
Date: Tue, 17 Dec 2019 14:08:39 +0100
Message-ID: <e7acf6bcdf5f267d8195377e74bd12005ce5949d.camel@cybertec.at> (raw)
In-Reply-To: <19575.1576529417@sss.pgh.pa.us>
References: <CABSfb-6iUvpGCzcgni+tVoiUWTc9aQdUtKbOzFzGqJcypiLa4g@mail.gmail.com>
	<adb87d39c5faa26d85274824ea4dd15ffc44ac40.camel@cybertec.at>
	<CABSfb-55VAcUwvy+PtsBsEk8EMfODtC6p65qVHSYhOqWWf80mA@mail.gmail.com>
	<CAH2-WzneCi_hM5_JGoPvGqKJr_Qd5hXcQzABz9-tQVndw9vwpw@mail.gmail.com>
	<19575.1576529417@sss.pgh.pa.us>

On Mon, 2019-12-16 at 15:50 -0500, Tom Lane wrote:
> Peter Geoghegan <pg@bowt.ie> writes:
> > Why do the first and the twentieth executions of the query have almost
> > identical "buffers shared/read" numbers? That seems odd.
> 
> It's repeat execution of the same query, so that doesn't seem odd to me.

Really?  Shouldn't the blocks be in shared buffers after a couple
of executions?

Yours,
Laurenz Albe
-- 
Cybertec | https://www.cybertec-postgresql.com






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