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From: John Beaver <john_beaver@hms.harvard.edu>
To: Pierre C <lists@peufeu.com>
Cc: pgsql-performance@postgresql.org <pgsql-performance@postgresql.org>
Subject: Re: *** PROBABLY SPAM *** Does the psql executable support a "fetch many" approach when dumping large queries to stdout?
Date: Fri, 2 Apr 2010 18:19:38 -0400
Message-ID: <4BB66D7A.1090605@hms.harvard.edu> (raw)
In-Reply-To: <op.vajyiejneorkce@immo.peufeu.com>
References: <62307826D0C1F74BAFE47B6747FA8C2C5407AED155@ITCCRMAIL02.MED.HARVARD.EDU>
	<op.vajyiejneorkce@immo.peufeu.com>

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That makes sense. I'll just use a COPY statement instead like Hannu
suggests.<br>
<br>
Pierre C wrote:
<blockquote cite="mid:op.vajyiejneorkce@immo.peufeu.com" type="cite">
  <blockquote type="cite">
    <pre wrap="">Does the psql executable have any ability to do a "fetch many", using a  
server-side named cursor, when returning results? It seems like it tries  
to retrieve the query entirely to local memory before printing to  
standard out.
    </pre>
  </blockquote>
  <pre wrap=""><!---->
I think it grabs the whole result set to calculate the display column  
widths. I think there is an option to tweak this but don't remember which,  
have a look at the psql commands (\?), formatting section.
  </pre>
</blockquote>
<br>
<pre class="moz-signature" cols="72">-- 
John E. Beaver
Bioinformatics Developer
Harvard Medical School</pre>
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