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Move pgstat.tmp into a temporary directory under $PGDATA named pg_stat_tmp.

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This allows the use of a ramdrive (either through mount or symlink) for
the temporary file that's written every half second, which should
reduce I/O.

On server shutdown/startup, the file is written to the old location in
the global directory, to preserve data across restarts.

Bump catversion since the $PGDATA directory layout changed.
This commit is contained in:
Magnus Hagander
2008-08-05 12:09:30 +00:00
parent 7e61edf2e7
commit 70d756970b
5 changed files with 62 additions and 28 deletions
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13
doc/src/sgml/monitoring.sgml
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@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/monitoring.sgml,v 1.60 2008/06/18 17:44:12 neilc Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/monitoring.sgml,v 1.61 2008/08/05 12:09:30 mha Exp $ -->
<chapter id="monitoring">
<title>Monitoring Database Activity</title>
@ -164,6 +164,17 @@ postgres: <replaceable>user</> <replaceable>database</> <replaceable>host</> <re
only superusers are allowed to change these parameters with
<command>SET</>.)
</para>
<para>
The statistics collector communicates with the backends needing
information (including autovacuum) through temporary files.
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.
</para>
</sect2>
<sect2 id="monitoring-stats-views">

8
doc/src/sgml/storage.sgml
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@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/storage.sgml,v 1.23 2008/05/02 01:08:26 tgl Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/storage.sgml,v 1.24 2008/08/05 12:09:30 mha Exp $ -->
<chapter id="storage">
@ -77,6 +77,12 @@ Item
(used for shared row locks)</entry>
</row>
<row>
<entry><filename>pg_stat_tmp</></entry>
<entry>Subdirectory containing temporary files for the statistics
subsystem</entry>
</row>
<row>
<entry><filename>pg_subtrans</></entry>
<entry>Subdirectory containing subtransaction status data</entry>