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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"> <chapter id="performance-tips">
@ -109,8 +109,8 @@ regression=# EXPLAIN SELECT * FROM tenk1;
SELECT * FROM pg_class WHERE relname = 'tenk1'; SELECT * FROM pg_class WHERE relname = 'tenk1';
</programlisting> </programlisting>
you will find out that <classname>tenk1</classname> has 333 disk you will find out that <classname>tenk1</classname> has 233 disk
pages and 10000 rows. So the cost is estimated at 333 page 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 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>). currently 0.01 (try <command>SHOW cpu_tuple_cost</command>).
</para> </para>

3
src/backend/utils/misc/postgresql.conf.sample
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@ -121,7 +121,8 @@
# panic # panic
#client_min_messages = notice # Values, in order of decreasing detail: #client_min_messages = notice # Values, in order of decreasing detail:
# debug5, debug4, debug3, debug2, debug1, # debug5, debug4, debug3, debug2, debug1,
# log, info, notice, warning, error # log, info, notice, warning, error,
# panic(off)
#silent_mode = false #silent_mode = false
#log_connections = false #log_connections = false