WARNING : pgstat wait timeout - stats_temp_directory - postgres 9.1

From: Mathieu Guerin <mathieu(dot)guerin64(at)gmail(dot)com>
To: pgsql-hackers(at)postgresql(dot)org
Subject: WARNING : pgstat wait timeout - stats_temp_directory - postgres 9.1
Date: 2013-05-23 10:06:15
Message-ID: CAFssqjM7Fbop2QdQ-kyNn50C5oGKvV1Z0ayUisDGQdh5G9q3Cw@mail.gmail.com
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Hello,

I am facing a problem with pgstat as my subject says. I known, some topics
are open about that, but I would like to go deeper.

Some person told that the better way to don't have this message anymore is
to configure pgstat.stat to be loaded in the RAM with a tmpfs mount point.

What are the consequences ? Because this file will be remove if the server
reboot.

If we change the parameter stats_temp_directory is it necessary to reboot
the server ?

When I lauch a SHOW ALL; command, the parameter stats_temp_director is not
here.

For information, my pgstat.stat file is up to 1,3MB.

Thank you for your help.
Math

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