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From:mos Date:March 19 2009 3:54pm
Subject:Re: Performance Spamassin PostgreSQL vs MySQL
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At 02:53 PM 3/18/2009, you wrote:
>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.

When the db is not vacuuming,  how is the speed? PostgreSQL is far superior 
to MySQL for multi-processor CPU's. But if you are sure the CPU level is 
low, then adding more CPU's is not going to help. When you say you are 
storing Bayes information, are you referring to Bayes' theorem so you are 
storing mostly numbers (Doubles?)?

How large are your tables (# of rows, row length & disk space?)

Are the rows being deleted or updated repeatedly? If not, then why do you 
need vacuuming?


Performance Spamassin PostgreSQL vs MySQLWm Mussatto18 Mar
  • Re: Performance Spamassin PostgreSQL vs MySQLmos19 Mar
  • RE: Performance Spamassin PostgreSQL vs MySQLMiles Thompson20 Mar