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From "Rob Staveley (Tom)" <rstave...@seseit.com>
Subject RE: What are norms?
Date Fri, 14 Jul 2006 14:47:16 GMT
Got it. Thanks Yonik.

-----Original Message-----
From: Yonik Seeley [mailto:yseeley@gmail.com] 
Sent: 14 July 2006 15:42
To: java-user@lucene.apache.org
Subject: Re: What are norms?

On 7/14/06, Rob Staveley (Tom) <rstaveley@seseit.com> wrote:
> I'm trying to reduce the memory requirement of my application that has 
> ~40 indexed fields. Would I be wasting my time omitting norms in this 
> application?
>
> What would I lose by omitting norms? The ability to boost individual 
> fields as they are added to the index? Anything else?

Length normalization of the field.  Full-text matches on shorter fields
score higher because the match is seen as more specific.  You loose that if
you omit norms.  That's typically OK for short fields like "title" anyway,
and fields that aren't full-text (like dates, numbers, etc).

-Yonik
http://incubator.apache.org/solr Solr, the open-source Lucene search server

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