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From: Steinar Bang <sb@metis.no>
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Subject: storing messages in DBMSes (Was: Attaching notes to messages)
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>>>>> Eric Marsden <emarsden@mail.dotcom.fr>:

> yes, using an nnpg backend which stores annotations and other metadata
> in a PostgreSQL database. Sure, Postgres is not as nice as PLOB! but
> it does have some OO features, it's free software, widely used,
> there's even a (&/%¤#) elisp interface to it :-)

>    <URL:http://www.chez.com/emarsden/downloads/pg.el>

Ah!  This is only the elisp interface to Postgres.  Presumable the
nnpg backend doesn't exist yet.

But that makes me wonder: with the scaling problems all folders seem
to have, has anyone ever thought about using database systems to store 
the messages themselves?