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Make the temporary directory for pgstat files configurable by the GUC

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variable stats_temp_directory, instead of requiring the admin to
mount/symlink the pg_stat_tmp directory manually.

For now the config variable is PGC_POSTMASTER. Room for further improvment
that would allow it to be changed on-the-fly.
This commit is contained in:
Magnus Hagander
2008-08-15 08:37:41 +00:00
parent f24f233f6a
commit 5b8eb2b4b9
6 changed files with 71 additions and 14 deletions
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18
doc/src/sgml/config.sgml
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@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.184 2008/07/18 17:33:17 momjian Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.185 2008/08/15 08:37:41 mha Exp $ -->
<chapter Id="runtime-config">
<title>Server Configuration</title>
@ -3394,6 +3394,22 @@ COPY postgres_log FROM '/full/path/to/logfile.csv' WITH csv;
</listitem>
</varlistentry>
<varlistentry id="guc-stats-temp-directory" xreflabel="stats_temp_directory">
<term><varname>stats_temp_directory</varname> (<type>string</type>)</term>
<indexterm>
<primary><varname>stats_temp_directory</> configuration parameter</primary>
</indexterm>
<listitem>
<para>
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
<filename>pg_stat_tmp</filename>. Pointing this at a RAM based filesystem
will decrease physical I/O requirements and can lead to increased
performance. This parameter can only be set at server start.
</para>
</listitem>
</varlistentry>
</variablelist>
</sect2>

6
doc/src/sgml/monitoring.sgml
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@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/monitoring.sgml,v 1.61 2008/08/05 12:09:30 mha Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/monitoring.sgml,v 1.62 2008/08/15 08:37:41 mha Exp $ -->
<chapter id="monitoring">
<title>Monitoring Database Activity</title>
@ -171,8 +171,8 @@ postgres: <replaceable>user</> <replaceable>database</> <replaceable>host</> <re
These files are stored in the <filename>pg_stat_tmp</filename> subdirectory.
When the postmaster shuts down, a permanent copy of the statistics
data is stored in the <filename>global</filename> subdirectory. For increased
performance, it is possible to mount or symlink a RAM based
filesystem to the <filename>pg_stat_tmp</filename> directory.
performance, the parameter <xref linkend="guc-stats-temp-directory"> can
be pointed at a RAM based filesystem, decreasing physical I/O requirements.
</para>
</sect2>