git.postgresql.org Git - postgresql.git/commitdiff

diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml

index a4e3eb020bb9e0ae06e613435bf1c2088bbcc3d7..b3223e3de43a122486461f484211997809d02dcf 100644 (file)

--- a/doc/src/sgml/config.sgml

+++ b/doc/src/sgml/config.sgml

-<!-- $PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.88 2006年09月18日 12:11:36 teodor Exp $ -->

+<!-- $PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.89 2006年09月25日 22:12:24 tgl Exp $ -->

<chapter Id="runtime-config">

<title>Server Configuration</title>

<listitem>

<para>

Sets the planner's assumption about the effective size of the

- disk cache that is available to a single index scan. This is

+ disk cache that is available to a single query. This is

factored into estimates of the cost of using an index; a

higher value makes it more likely index scans will be used, a

lower value makes it more likely sequential scans will be

<productname>PostgreSQL</productname>'s shared buffers and the

portion of the kernel's disk cache that will be used for

<productname>PostgreSQL</productname> data files. Also, take

- into account the expected number of concurrent queries using

- different indexes, since they will have to share the available

+ into account the expected number of concurrent queries on different

+ tables, since they will have to share the available

space. This parameter has no effect on the size of shared

memory allocated by <productname>PostgreSQL</productname>, nor

does it reserve kernel disk cache; it is used only for

estimation purposes. The value is measured in disk pages,

- which are normally 8192 bytes each. The default is 1000.

+ which are normally 8192 bytes each. The default is 16384 (128 MB).

</para>

</listitem>

</varlistentry>

diff --git a/src/backend/utils/misc/postgresql.conf.sample b/src/backend/utils/misc/postgresql.conf.sample

index 40a205a501a6b97606ad910d2431862b62c125b2..13408899dc37c5fe11a35e5af56331d1005e73ba 100644 (file)

--- a/src/backend/utils/misc/postgresql.conf.sample

+++ b/src/backend/utils/misc/postgresql.conf.sample

#cpu_tuple_cost = 0.01 # same scale as above

#cpu_index_tuple_cost = 0.005 # same scale as above

#cpu_operator_cost = 0.0025 # same scale as above

-#effective_cache_size = 8000kB

+#effective_cache_size = 128MB

# - Genetic Query Optimizer -

diff --git a/src/include/optimizer/cost.h b/src/include/optimizer/cost.h

index e0250f5f396847b985635a0f2147bdc36917cb8e..ce61e261a95968281dde3d0fdac94888049b48ac 100644 (file)

--- a/src/include/optimizer/cost.h

+++ b/src/include/optimizer/cost.h

* Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group

* Portions Copyright (c) 1994, Regents of the University of California

*

- * $PostgreSQL: pgsql/src/include/optimizer/cost.h,v 1.80 2006年09月19日 22:49:53 tgl Exp $

+ * $PostgreSQL: pgsql/src/include/optimizer/cost.h,v 1.81 2006年09月25日 22:12:24 tgl Exp $

*

*-------------------------------------------------------------------------

*/

#define DEFAULT_CPU_INDEX_TUPLE_COST 0.005

#define DEFAULT_CPU_OPERATOR_COST 0.0025

-#define DEFAULT_EFFECTIVE_CACHE_SIZE 1000 /* measured in pages */

+#define DEFAULT_EFFECTIVE_CACHE_SIZE 16384 /* measured in pages */

/*