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Unconditionally write the statsfile when SIGHUP is received, to minimize

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the window during which backends have no statistics file to read.
This commit is contained in:
Magnus Hagander
2008-08-25 18:55:43 +00:00
parent d96d7be2b5
commit f1e237b6b2
2 changed files with 7 additions and 4 deletions
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doc/src/sgml/config.sgml
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@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.188 2008/08/25 15:11:00 mha Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.189 2008/08/25 18:55:43 mha Exp $ -->
<chapter Id="runtime-config">
<title>Server Configuration</title>
@ -3419,8 +3419,8 @@ COPY postgres_log FROM '/full/path/to/logfile.csv' WITH csv;
<filename>pg_stat_tmp</filename>. Pointing this at a RAM based filesystem
will decrease physical I/O requirements and can lead to increased
performance. If this parameter is changed when the system is running,
the statistics functions might return no information until a new
file has been written, which typically happens twice per second.
there is a small window of time until the new file has been written
during which the statistics functions might return no information.
</para>
</listitem>
</varlistentry>