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RANDOM_PAGE_COST clarification of docs.

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Joseph Shraibman
This commit is contained in:
Bruce Momjian 2002-12-06 05:17:03 +00:00
parent a2bd3e2085
commit 982b26c0a9
1 changed files with 4 additions and 2 deletions
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6
doc/src/sgml/runtime.sgml
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@ -1,5 +1,5 @@
<!-- <!--
$Header: /cvsroot/pgsql/doc/src/sgml/runtime.sgml,v 1.160 2002/12/04 21:43:07 momjian Exp $ $Header: /cvsroot/pgsql/doc/src/sgml/runtime.sgml,v 1.161 2002/12/06 05:17:03 momjian Exp $
--> -->
<Chapter Id="runtime"> <Chapter Id="runtime">
@ -841,7 +841,9 @@ env PGOPTIONS='-c geqo=off' psql
<para> <para>
Sets the query optimizer's estimate of the cost of a Sets the query optimizer's estimate of the cost of a
nonsequentially fetched disk page. This is measured as a nonsequentially fetched disk page. This is measured as a
multiple of the cost of a sequential page fetch. multiple of the cost of a sequential page fetch. A higher
value makes it more likely a sequential scan will be used,
a lower value makes it more likely an index scan will be used.
</para> </para>
</listitem> </listitem>
</varlistentry> </varlistentry>