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<title>17.8.Run-Time Statistics</title>
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<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="sect1" lang="en">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="runtime-config-statistics"></a>17.8.Run-Time Statistics</h2></div></div></div>
<div class="sect2" lang="en">
<div class="titlepage"><div><div><h3 class="title">
<a name="runtime-config-statistics-monitor"></a>17.8.1.Statistics Monitoring</h3></div></div></div>
<div class="variablelist"><dl>
<dt>
<span xmlns="http://www.w3.org/TR/xhtml1/transitional" class="term"><code xmlns="" class="varname">log_statement_stats</code> (<code xmlns="" class="type">boolean</code>)</span><br xmlns="http://www.w3.org/TR/xhtml1/transitional"></br><span xmlns="http://www.w3.org/TR/xhtml1/transitional" class="term"><code xmlns="" class="varname">log_parser_stats</code> (<code xmlns="" class="type">boolean</code>)</span><br xmlns="http://www.w3.org/TR/xhtml1/transitional"></br><span xmlns="http://www.w3.org/TR/xhtml1/transitional" class="term"><code xmlns="" class="varname">log_planner_stats</code> (<code xmlns="" class="type">boolean</code>)</span><br xmlns="http://www.w3.org/TR/xhtml1/transitional"></br><span class="term"><code class="varname">log_executor_stats</code> (<code class="type">boolean</code>)</span>
</dt>
<dd><p> For each query, write performance statistics of the respective
module to the server log. This is a crude profiling
instrument. <code class="varname">log_statement_stats</code> reports total
statement statistics, while the others report per-module statistics.
<code class="varname">log_statement_stats</code> cannot be enabled together with
any of the per-module options. All of these options are disabled by
default. Only superusers can change these settings.
</p></dd>
</dl></div>
</div>
<div class="sect2" lang="en">
<div class="titlepage"><div><div><h3 class="title">
<a name="runtime-config-statistics-collector"></a>17.8.2.Query and Index Statistics Collector</h3></div></div></div>
<div class="variablelist"><dl>
<dt>
<a name="guc-stats-start-collector"></a><span class="term"><code class="varname">stats_start_collector</code> (<code class="type">boolean</code>)</span>
</dt>
<dd><p> Controls whether the server should start the
statistics-collection subprocess. This is on by default, but
may be turned off if you know you have no interest in
collecting statistics. This option can only be set at server
start.
</p></dd>
<dt>
<a name="guc-stats-command-string"></a><span class="term"><code class="varname">stats_command_string</code> (<code class="type">boolean</code>)</span>
</dt>
<dd><p> Enables the collection of statistics on the currently
executing command of each session, along with the time at
which that command began execution. This option is off by
default. Note that even when enabled, this information is not
visible to all users, only to superusers and the user owning
the session being reported on; so it should not represent a
security risk. This data can be accessed via the
<code class="structname">pg_stat_activity</code> system view; refer
to <a href="monitoring.html" title="Chapter24.Monitoring Database Activity">Chapter24, <i>Monitoring Database Activity</i></a> for more information.
</p></dd>
<dt>
<a name="guc-stats-block-level"></a><span class="term"><code class="varname">stats_block_level</code> (<code class="type">boolean</code>)</span>
</dt>
<dd><p> Enables the collection of block-level statistics on database
activity. This option is disabled by default. If this option
is enabled, the data that is produced can be accessed via the
<code class="structname">pg_stat</code> and
<code class="structname">pg_statio</code> family of system views;
refer to <a href="monitoring.html" title="Chapter24.Monitoring Database Activity">Chapter24, <i>Monitoring Database Activity</i></a> for more information.
</p></dd>
<dt>
<a name="guc-stats-row-level"></a><span class="term"><code class="varname">stats_row_level</code> (<code class="type">boolean</code>)</span>
</dt>
<dd><p> Enables the collection of row-level statistics on database
activity. This option is disabled by default. If this option
is enabled, the data that is produced can be accessed via the
<code class="structname">pg_stat</code> and
<code class="structname">pg_statio</code> family of system views;
refer to <a href="monitoring.html" title="Chapter24.Monitoring Database Activity">Chapter24, <i>Monitoring Database Activity</i></a> for more information.
</p></dd>
<dt>
<a name="guc-stats-reset-on-server-start"></a><span class="term"><code class="varname">stats_reset_on_server_start</code> (<code class="type">boolean</code>)</span>
</dt>
<dd><p> If on, collected statistics are zeroed out whenever the server
is restarted. If off, statistics are accumulated across server
restarts. The default is <code class="literal">off</code>. This option can only
be set at server start.
</p></dd>
</dl></div>
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