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Add an EXPLAIN (BUFFERS) option to show buffer-usage statistics.

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This patch also removes buffer-usage statistics from the track_counts
output, since this (or the global server statistics) is deemed to be a better
interface to this information.

Itagaki Takahiro, reviewed by Euler Taveira de Oliveira.
This commit is contained in:
Robert Haas
2009-12-15 04:57:48 +00:00
parent 6f1bf75d50
commit cddca5ec13
25 changed files with 274 additions and 140 deletions
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21
doc/src/sgml/auto-explain.sgml
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@@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/auto-explain.sgml,v 1.5 2009/12/11 01:33:35 adunstan Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/auto-explain.sgml,v 1.6 2009/12/15 04:57:47 rhaas Exp $ -->
<sect1 id="auto-explain">
<title>auto_explain</title>
@@ -102,6 +102,25 @@ LOAD 'auto_explain';
</listitem>
</varlistentry>
<varlistentry>
<term>
<varname>auto_explain.log_buffers</varname> (<type>boolean</type>)
</term>
<indexterm>
<primary><varname>auto_explain.log_buffers</> configuration parameter</primary>
</indexterm>
<listitem>
<para>
<varname>auto_explain.log_buffers</varname> causes <command>EXPLAIN
(ANALYZE, BUFFERS)</> output, rather than just <command>EXPLAIN</>
output, to be printed when an execution plan is logged. This parameter is
off by default. Only superusers can change this setting. This
parameter has no effect unless <varname>auto_explain.log_analyze</>
parameter is set.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<varname>auto_explain.log_format</varname> (<type>enum</type>)