Alex,

> I have a rather large bayes database with spamassassin now, and would
> like to investigate some performance tuning options to optimize memory
> usage and disk access.
> 
> I came across this PDF from Marc from a few years ago, and although I
> think it's a bit dated, it looks helpful:
 
> http://www.ijs.si/software/amavisd/amavisd-new-magdeburg-20050519.pdf

There is also a more recent presentation:

http://www.ijs.si/software/amavisd/amavis-berlin-20090703.pdf
 
> How can I enable bayes in bdb with a global cache, as it references
> on page 12?

$db_home = "$MYHOME/db";
$enable_db = 0;
$enable_global_cache = 0;

Although it is less effective than it used to be, nowadays when
spam messages are being personalized and virus outbreaks are
less severe.

> Does anyone know where I can find amavisd-nanny to help monitor
> amavisd for message processing issues?

amavisd-nanny comes with the amavis package. It first appeared
in amavisd-new-2.1.0, but was refined in later versions.

> Is it possible to monitor it via SNMP?

Yes, starting with amavisd-new-2.6.4 there is a true SNMP agent
in the amavisd package - see release notes. Also mentioned in
amavis-berlin-20090703.pdf, page 85, with some sample screenshots.

> I'm using an older version of amavisd-new now, but am currently in the
> process of upgrading. In the interim, I'd like to make some
> performance improvements to ease the load until I can upgrade.

Move Bayes and AWL databases to SQL, if you haven't already done so.
See sql/bayes_mysql.sql and sql/README.bayes in the SpamAssassin package.
Using InnoDB and Mail::SpamAssassin::BayesStore::MySQL is a must
(i.e. do not use Mail::SpamAssassin::BayesStore::SQL as a bayes_store_module).

  Mark

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