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><H1
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><A
NAME="RUNTIME-CONFIG-STATISTICS"
>18.9. Run-time Statistics</A
></H1
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="RUNTIME-CONFIG-STATISTICS-COLLECTOR"
>18.9.1. Query and Index Statistics Collector</A
></H2
><P
>      These parameters control server-wide statistics collection features.
      When statistics collection is enabled, the data that is produced can be
      accessed via the <TT
CLASS="STRUCTNAME"
>pg_stat</TT
> and
      <TT
CLASS="STRUCTNAME"
>pg_statio</TT
> family of system views.
      Refer to <A
HREF="monitoring.html"
>Chapter 27</A
> for more information.
     </P
><P
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><DT
><A
NAME="GUC-TRACK-ACTIVITIES"
></A
><TT
CLASS="VARNAME"
>track_activities</TT
> (<TT
CLASS="TYPE"
>boolean</TT
>)</DT
><DD
><P
>        Enables the collection of information on the currently
        executing command of each session, along with the time when
        that command began execution. This parameter is on 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.
        Only superusers can change this setting.
       </P
></DD
><DT
><A
NAME="GUC-TRACK-ACTIVITY-QUERY-SIZE"
></A
><TT
CLASS="VARNAME"
>track_activity_query_size</TT
> (<TT
CLASS="TYPE"
>integer</TT
>)</DT
><DD
><P
>       Specifies the number of bytes reserved to track the currently
       executing command for each active session, for the
       <TT
CLASS="STRUCTNAME"
>pg_stat_activity</TT
>.<TT
CLASS="STRUCTFIELD"
>query</TT
> field.
       The default value is 1024. This parameter can only be set at server
       start.
       </P
></DD
><DT
><A
NAME="GUC-TRACK-COUNTS"
></A
><TT
CLASS="VARNAME"
>track_counts</TT
> (<TT
CLASS="TYPE"
>boolean</TT
>)</DT
><DD
><P
>        Enables collection of statistics on database activity.
        This parameter is on by default, because the autovacuum
        daemon needs the collected information.
        Only superusers can change this setting.
       </P
></DD
><DT
><A
NAME="GUC-TRACK-IO-TIMING"
></A
><TT
CLASS="VARNAME"
>track_io_timing</TT
> (<TT
CLASS="TYPE"
>boolean</TT
>)</DT
><DD
><P
>        Enables timing of database I/O calls.  This parameter is off by
        default, because it will repeatedly query the operating system for
        the current time, which may cause significant overhead on some
        platforms.  You can use the <A
HREF="pgtesttiming.html"
><SPAN
CLASS="APPLICATION"
>pg_test_timing</SPAN
></A
> tool to
        measure the overhead of timing on your system.
        I/O timing information is
        displayed in <A
HREF="monitoring-stats.html#PG-STAT-DATABASE-VIEW"
>pg_stat_database</A
>, in the output of
        <A
HREF="sql-explain.html"
>EXPLAIN</A
> when the <TT
CLASS="LITERAL"
>BUFFERS</TT
> option is
        used, and by <A
HREF="pgstatstatements.html"
>pg_stat_statements</A
>.  Only superusers can
        change this setting.
       </P
></DD
><DT
><A
NAME="GUC-TRACK-FUNCTIONS"
></A
><TT
CLASS="VARNAME"
>track_functions</TT
> (<TT
CLASS="TYPE"
>enum</TT
>)</DT
><DD
><P
>        Enables tracking of function call counts and time used. Specify
        <TT
CLASS="LITERAL"
>pl</TT
> to track only procedural-language functions,
        <TT
CLASS="LITERAL"
>all</TT
> to also track SQL and C language functions.
        The default is <TT
CLASS="LITERAL"
>none</TT
>, which disables function
        statistics tracking.  Only superusers can change this setting.
       </P
><DIV
CLASS="NOTE"
><BLOCKQUOTE
CLASS="NOTE"
><P
><B
>Note: </B
>         SQL-language functions that are simple enough to be <SPAN
CLASS="QUOTE"
>"inlined"</SPAN
>
         into the calling query will not be tracked, regardless of this
         setting.
        </P
></BLOCKQUOTE
></DIV
></DD
><DT
><A
NAME="GUC-UPDATE-PROCESS-TITLE"
></A
><TT
CLASS="VARNAME"
>update_process_title</TT
> (<TT
CLASS="TYPE"
>boolean</TT
>)</DT
><DD
><P
>        Enables updating of the process title every time a new SQL command
        is received by the server.  The process title is typically viewed
        by the <TT
CLASS="COMMAND"
>ps</TT
> command,
        or in Windows by using the <SPAN
CLASS="APPLICATION"
>Process Explorer</SPAN
>.
        Only superusers can change this setting.
       </P
></DD
><DT
><A
NAME="GUC-STATS-TEMP-DIRECTORY"
></A
><TT
CLASS="VARNAME"
>stats_temp_directory</TT
> (<TT
CLASS="TYPE"
>string</TT
>)</DT
><DD
><P
>        Sets the directory to store temporary statistics data in. This can be
        a path relative to the data directory or an absolute path. The default
        is <TT
CLASS="FILENAME"
>pg_stat_tmp</TT
>. Pointing this at a RAM-based
        file system will decrease physical I/O requirements and can lead to
        improved performance.
        This parameter can only be set in the <TT
CLASS="FILENAME"
>postgresql.conf</TT
>
        file or on the server command line.
       </P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="RUNTIME-CONFIG-STATISTICS-MONITOR"
>18.9.2. Statistics Monitoring</A
></H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
><TT
CLASS="VARNAME"
>log_statement_stats</TT
> (<TT
CLASS="TYPE"
>boolean</TT
>)<BR><TT
CLASS="VARNAME"
>log_parser_stats</TT
> (<TT
CLASS="TYPE"
>boolean</TT
>)<BR><TT
CLASS="VARNAME"
>log_planner_stats</TT
> (<TT
CLASS="TYPE"
>boolean</TT
>)<BR><TT
CLASS="VARNAME"
>log_executor_stats</TT
> (<TT
CLASS="TYPE"
>boolean</TT
>)</DT
><DD
><P
>        For each query, output performance statistics of the respective
        module to the server log. This is a crude profiling
        instrument, similar to the Unix <CODE
CLASS="FUNCTION"
>getrusage()</CODE
> operating
        system facility.  <TT
CLASS="VARNAME"
>log_statement_stats</TT
> reports total
        statement statistics, while the others report per-module statistics.
        <TT
CLASS="VARNAME"
>log_statement_stats</TT
> 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
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