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Add temp_buffers GUC variable to allow users to determine the size

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of the local buffer arena for temporary table access.
This commit is contained in:
Tom Lane
2005-03-19 23:27:11 +00:00
parent d65522aeb6
commit 91728fa26c
8 changed files with 89 additions and 28 deletions
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29
doc/src/sgml/runtime.sgml
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@@ -1,5 +1,5 @@
<!--
$PostgreSQL: pgsql/doc/src/sgml/runtime.sgml,v 1.309 2005/03/14 06:49:48 neilc Exp $
$PostgreSQL: pgsql/doc/src/sgml/runtime.sgml,v 1.310 2005/03/19 23:27:04 tgl Exp $
-->
<chapter Id="runtime">
@@ -1038,6 +1038,33 @@ SET ENABLE_SEQSCAN TO OFF;
</listitem>
</varlistentry>
<varlistentry id="guc-temp-buffers" xreflabel="temp_buffers">
<term><varname>temp_buffers</varname> (<type>integer</type>)</term>
<indexterm>
<primary><varname>temp_buffers</> configuration parameter</primary>
</indexterm>
<listitem>
<para>
Sets the maximum number of temporary buffers used by each database
session. These are session-local buffers used only for access
to temporary tables. The default is 1000. The setting can
be changed within individual sessions, but only up until the
first use of temporary tables within a session; subsequent
attempts to change the value will have no effect on that session.
</para>
<para>
A session will allocate temporary buffers as needed up to the limit
given by <varname>temp_buffers</>. The cost of setting a large
value in sessions that do not actually need a lot of temporary
buffers is only a buffer descriptor, or about 64 bytes, per
increment in <varname>temp_buffers</>. However if a buffer is
actually used an additional 8192 bytes will be consumed for it
(or in general <symbol>BLCKSZ</symbol> bytes).
</para>
</listitem>
</varlistentry>
<varlistentry id="guc-work-mem" xreflabel="work_mem">
<term><varname>work_mem</varname> (<type>integer</type>)</term>
<indexterm>