We had an awkward setup, which forced us to use PGSQL for SpamAssassin. Unfortunately the
SA queries are not processed well by PGSQL.
Back in January we switched SA processing to MySQL. Bingo! Instant improvement in overall
performance, and no PGSQL maintenance required. This is not sophisticated box - about 3
yr old, 2Mbytes RAM.
> Date: Wed, 18 Mar 2009 12:53:45 -0700
> Subject: Performance Spamassin PostgreSQL vs MySQL
> From: mussatto@stripped
> To: mysql@stripped
> We are using the PostgreSQL currently to store the Bayes information. It
> seems to periodically spend a lot of time 'vacumming' which of course
> drives up disk load. The system admin has adjusted it so it only does
> this at low load. I'm curious if anyone has actually tested the
> PostgreSQL vs MySQL versions. We are currently running a uniprocessor
> system (Linux version 2.6.18-6-vserver-amd64 (Debian 2.6.18.dfsg.1-24).
> System appears disk limited, we have the files on hardware raid 0 and have
> moved nearly everything else off that set (they are the fastest drives).
> Just curious. Thanks.
> Bill Mussatto
> CyberStrategies, Inc.
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