postgres.git / summary / log / commit / refs

commit    07ab261ef3a9575a4a2bd3045b222d7b3dee2c46
Author:   Robert Haas <rhaas@postgresql.org>
Date:     Wed May 29 11:11:21 2013 +0000
First released in: 9.3.0, 9.2.5

    Document auto_explain.log_timing.
    
    Tomas Vondra


 doc/src/sgml/auto-explain.sgml | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/doc/src/sgml/auto-explain.sgml b/doc/src/sgml/auto-explain.sgml
index 8325f0371d1..03b2309da8f 100644
--- a/doc/src/sgml/auto-explain.sgml
+++ b/doc/src/sgml/auto-explain.sgml
@@ -139,6 +139,27 @@ LOAD 'auto_explain';
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term>
+     <varname>auto_explain.log_timing</varname> (<type>boolean</type>)
+    </term>
+    <indexterm>
+     <primary><varname>auto_explain.log_timing</> configuration parameter</primary>
+    </indexterm>
+    <listitem>
+     <para>
+      <varname>auto_explain.log_timing</varname> causes <command>EXPLAIN
+      (ANALYZE, TIMING off)</> output, rather than just <command>EXPLAIN (ANALYZE)</>
+      output. The overhead of repeatedly reading the system clock can slow down the
+      query significantly on some systems, so it may be useful to set this
+      parameter to <literal>FALSE</literal> when only actual row counts, and not
+      exact times, are needed.
+      This parameter is only effective when <varname>auto_explain.log_analyze</varname>
+      is also enabled.  It defaults to <literal>TRUE</literal>.
+     </para>
+    </listitem>
+   </varlistentry>
+   
    <varlistentry>
     <term>
      <varname>auto_explain.log_nested_statements</varname> (<type>boolean</type>)


[parent: f80e55054bb4]