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Change the pgstat logic so that the stats collector writes the stats file only
upon requests from backends, rather than on a fixed 500msec cycle. (There's still throttling logic to ensure it writes no more often than once per 500msec, though.) This should result in a significant reduction in stats file write traffic in typical scenarios where the stats are demanded only infrequently. This approach also means that the former difficulty with changing stats_temp_directory on-the-fly has gone away, so remove the caution about that as well as the thrashing we did to minimize the trouble window. In passing, also fix pgstat_report_stat() so that we will send a stats message if we have function call stats but not table stats to report; this fixes a bug in the recent patch to support function-call stats. Martin Pihlak
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‎doc/src/sgml/config.sgml

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<!-- $PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.191 2008/09/30 10:52:09 heikki Exp $ -->
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<!-- $PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.192 2008/11/03 01:17:08 tgl Exp $ -->
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<chapter Id="runtime-config">
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<title>Server Configuration</title>
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improved performance.
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This parameter can only be set in the <filename>postgresql.conf</>
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file or on the server command line.
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If this parameter is changed while the server is running, there is a
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small window of time until the new statistics file has been written
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during which the statistics functions might return no information.
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</para>
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</listitem>
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</varlistentry>

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