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Re: Wich hardware suits best for large full-text indexed

From: Ericson Smith <eric(at)did-it(dot)com>
To: Bill Moran <wmoran(at)potentialtech(dot)com>
Cc: Diogo Biazus <diogo(at)ikono(dot)com(dot)br>, pgsql-general(at)postgresql(dot)org
Subject: Re: Wich hardware suits best for large full-text indexed
Date: 2004-03-31 05:59:04
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Lists: pgsql-general
Look into running Swish-e instead:

Great speed, nice engine, excellent boolean searches. We run it on 
several sites each with over 500,000 documents. Performance is 
consistently sub-second response time, and we also integrate it within 
PHP, Perl and Postgresql too.

I know, it is nice to use tsearch2, but we also found the performance 
lacking for those big indices. Maybe Oleg and the tsearch2 gang have 
some extra tips?

- Ericson

Bill Moran wrote:

> Diogo Biazus wrote:
>> Hi folks,
>> I have a database using tsearch2 to index 300 000 documents.
>> I've already have optimized the queries, and the database is vacuumed 
>> on a daily basis.
>> The stat function tells me that my index has aprox. 460 000 unique 
>> words (I'm using stemmer and a nice stopword list).
>> The problem is performance, some queries take more than 10 seconds to 
>> execute, and I'm not sure if my bottleneck is memory or io.
>> The server is a Athlon XP 2000, HD ATA133, 1.5 GB RAM running 
>> postgresql 7.4.3 over freebsd 5.0 with lots of shared buffers and 
>> sort_mem...
>> Does anyone has an idea of a more cost eficient solution?
>> How to get a better performance without having to invest some 
>> astronomicaly high amount of money?
> This isn't hardware related, but FreeBSD 5 is not a particularly 
> impressive
> performer.  Especially 5.0 ... 5.2.1 would be better, but if you're 
> shooting
> for performance, 4.9 will probably outperform both of them at this 
> stage of
> the game.
> Something to consider if the query tuning that others are helping with 
> doesn't
> solve the problem.  Follow through with that _first_ though.
> However, if you insist on running 5, make sure your kernel is compiled 
> without
> WITNESS ... it speeds things up noticably.

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