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Revert optimizer page count change.

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This commit is contained in:
Bruce Momjian
2003-01-28 03:34:29 +00:00
parent bd175cc9fb
commit f21fb30dfc
2 changed files with 5 additions and 4 deletions
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6
doc/src/sgml/perform.sgml
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@ -1,5 +1,5 @@
<!--
$Header: /cvsroot/pgsql/doc/src/sgml/perform.sgml,v 1.25 2003/01/27 22:40:56 momjian Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/perform.sgml,v 1.26 2003/01/28 03:34:29 momjian Exp $
-->
<chapter id="performance-tips">
@ -109,8 +109,8 @@ regression=# EXPLAIN SELECT * FROM tenk1;
SELECT * FROM pg_class WHERE relname = 'tenk1';
</programlisting>
you will find out that <classname>tenk1</classname> has 333 disk
pages and 10000 rows. So the cost is estimated at 333 page
you will find out that <classname>tenk1</classname> has 233 disk
pages and 10000 rows. So the cost is estimated at 233 page
reads, defined as costing 1.0 apiece, plus 10000 * <varname>cpu_tuple_cost</varname> which is
currently 0.01 (try <command>SHOW cpu_tuple_cost</command>).
</para>