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Mikko Partio wrote: <blockquote type="cite"><div><div>Isn't 128MB quite low considering the "current standard" of 25% -50% of total ram?<br /></div></div></blockquote><br /> I had also read a statement about using this amount of memory asshared buffers. Exactly that was the reason why I set it to such a high value, but I am now convinced that this is wrong.<br/><br /><a class="moz-txt-link-freetext" href="http://www.varlena.com/varlena/GeneralBits/Tidbits/perf.html#shbuf">http://www.varlena.com/varlena/GeneralBits/Tidbits/perf.html#shbuf</a><br />and<br /><a class="moz-txt-link-freetext" href="http://www.varlena.com/varlena/GeneralBits/Tidbits/annotated_conf_e.html">http://www.varlena.com/varlena/GeneralBits/Tidbits/annotated_conf_e.html</a><br />are quite clear about this.<br /><br /> On the other hand, <a class="moz-txt-link-freetext" href="http://edoceo.com/liber/db-postgresql-performance.php">http://edoceo.com/liber/db-postgresql-performance.php</a> says:<br/><blockquote type="cite"><dl><dt>Shared Memory<dd>PostgreSQL uses lots of this, view <code>ipcs</code> to proveit, the more shared memory the better as more data (tables) can be loaded. On a dedicated datbase server it's not uncommonto give half the memory to the database.</dl></blockquote> and<br /><blockquote type="cite"><dl><dt>shared_buffers= N<dd>Set anywhere from 1/4 to 1/2 physical memory, must set kernel shared memory maxfirst. Will see noticeable difference.</dl></blockquote> Since the first links are also mentioned on the official PostgreSQLwebsite (<a class="moz-txt-link-freetext" href="http://www.postgresql.org/docs/techdocs.2">http://www.postgresql.org/docs/techdocs.2</a>)I think they should be trustedmore.<br /><br /> Regards,<br /> Christian<br /><pre class="moz-signature" cols="72">-- Deriva GmbH Tel.: +49 551 489500-42 Financial IT and Consulting Fax: +49 551 489500-91 Hans-Böckler-Straße 2 <a class="moz-txt-link-freetext" href="http://www.deriva.de">http://www.deriva.de</a> D-37079 Göttingen Deriva CA Certificate: <a class="moz-txt-link-freetext" href="http://www.deriva.de/deriva-ca.cer">http://www.deriva.de/deriva-ca.cer</a></pre>
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