pg.ddx.io  pgsql-performance@postgresql.org mailing list archive  

help / color / mirror / Atom feed
From: Jeremy Harris <jgh@wizmail.org>
To: pgsql-performance@postgresql.org
Subject: Re: [HACKERS] Slow count(*) again...
Date: Fri, 04 Feb 2011 00:29:22 +0000
Message-ID: <4D4B4862.20203@wizmail.org> (raw)
In-Reply-To: <AANLkTikmChsPODbUD4V-gQ8k2yYvvjJY6b9K_29+k7nu@mail.gmail.com>
References: <201102012247.p11Ml6u02682@momjian.us>
	<4D48914B.4050403@dunslane.net>
	<4D489AD1.1010105@vmsinfo.com>
	<AANLkTiknZi97dDwm7sHqy0EL7tpNEP9sY5uPV6AN+q=u@mail.gmail.com>
	<4D499E55.4020107@vmsinfo.com>
	<AANLkTimo2J-BagObs_V1bGaHOO9qL+kTF6s6-wZ=M3KW@mail.gmail.com>
	<AANLkTin7A_Q=Yc9Wf_5=POp2mVqmaiwqUDsFMLG68H45@mail.gmail.com>
	<4D4A7B69.2020704@gmail.com>
	<alpine.DEB.2.00.1102030208440.8162@asgard.lang.hm>
	<AANLkTi=Thet0VZ-X6b7tek+iSLVkE27JjiKrB5D8U0Jd@mail.gmail.com>
	<alpine.DEB.2.00.1102031243190.10088@asgard.lang.hm>
	<AANLkTikmChsPODbUD4V-gQ8k2yYvvjJY6b9K_29+k7nu@mail.gmail.com>

On 2011-02-03 23:29, Robert Haas wrote:
> Yeah, but you'll be passing the entire table through this separate
> process that may only need to see 1% of it or less on a large table.

It doesn't sound too impossible to pass only a percentage, starting high
and dropping towards 1% once the loaded size has become "large".
-- 
Jeremy



view thread (246+ messages)  latest in thread

Message-ID: <4D4B4862.20203@wizmail.org>
Permalink:  ../4D4B4862.20203@wizmail.org/
Also on:    postgresql.org/message-id/4D4B4862.20203@wizmail.org

 · 

reply
Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Reply to all the recipients using the --to and --cc options:
  reply via email

  To: pgsql-performance@postgresql.org
  Cc: jgh@wizmail.org
  Subject: Re: [HACKERS] Slow count(*) again...
  In-Reply-To: <4D4B4862.20203@wizmail.org>

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox