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Increase the default value of cpu_index_tuple_cost from 0.001 to 0.005. 

This shouldn't affect simple indexscans much, while for bitmap scans that
are touching a lot of index rows, this seems to bring the estimates more
in line with reality.  Per recent discussion.
This commit is contained in:
Tom Lane 2006-06-05 03:03:42 +00:00
parent eed6c9ed7e
commit e4de635a2b
3 changed files with 5 additions and 5 deletions
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4
doc/src/sgml/config.sgml
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@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.60 2006/06/05 02:49:58 tgl Exp $ --> <!-- $PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.61 2006/06/05 03:03:42 tgl Exp $ -->
<chapter Id="runtime-config"> <chapter Id="runtime-config">
<title>Server Configuration</title> <title>Server Configuration</title>
@ -1831,7 +1831,7 @@ archive_command = 'copy "%p" /mnt/server/archivedir/"%f"' # Windows
<para> <para>
Sets the planner's estimate of the cost of processing Sets the planner's estimate of the cost of processing
each index entry during an index scan. each index entry during an index scan.
The default is 0.001. The default is 0.005.
</para> </para>
</listitem> </listitem>
</varlistentry> </varlistentry>

2
src/backend/utils/misc/postgresql.conf.sample
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@ -178,7 +178,7 @@
#seq_page_cost = 1.0 # measured on an arbitrary scale #seq_page_cost = 1.0 # measured on an arbitrary scale
#random_page_cost = 4.0 # same scale as above #random_page_cost = 4.0 # same scale as above
#cpu_tuple_cost = 0.01 # same scale as above #cpu_tuple_cost = 0.01 # same scale as above
#cpu_index_tuple_cost = 0.001 # same scale as above #cpu_index_tuple_cost = 0.005 # same scale as above
#cpu_operator_cost = 0.0025 # same scale as above #cpu_operator_cost = 0.0025 # same scale as above
#effective_cache_size = 1000 # typically 8KB each #effective_cache_size = 1000 # typically 8KB each

4
src/include/optimizer/cost.h
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group * Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California * Portions Copyright (c) 1994, Regents of the University of California
* *
* $PostgreSQL: pgsql/src/include/optimizer/cost.h,v 1.74 2006/06/05 02:49:58 tgl Exp $ * $PostgreSQL: pgsql/src/include/optimizer/cost.h,v 1.75 2006/06/05 03:03:42 tgl Exp $
* *
*------------------------------------------------------------------------- *-------------------------------------------------------------------------
*/ */
@ -24,7 +24,7 @@
#define DEFAULT_SEQ_PAGE_COST 1.0 #define DEFAULT_SEQ_PAGE_COST 1.0
#define DEFAULT_RANDOM_PAGE_COST 4.0 #define DEFAULT_RANDOM_PAGE_COST 4.0
#define DEFAULT_CPU_TUPLE_COST 0.01 #define DEFAULT_CPU_TUPLE_COST 0.01
#define DEFAULT_CPU_INDEX_TUPLE_COST 0.001 #define DEFAULT_CPU_INDEX_TUPLE_COST 0.005
#define DEFAULT_CPU_OPERATOR_COST 0.0025 #define DEFAULT_CPU_OPERATOR_COST 0.0025
#define DEFAULT_EFFECTIVE_CACHE_SIZE 1000.0 /* measured in pages */ #define DEFAULT_EFFECTIVE_CACHE_SIZE 1000.0 /* measured in pages */