This is I found in docs:
 
Omitting norms is useful for saving memory on Fields that do not affect 
scoring, such as those used for calculating facets.
 
I don't really understand the statement, but does it mean I cannot use those 
fields as facet fields, because this is exactly why I need those 100 fields.
 


----- Original Message ----
From: Yonik Seeley <[EMAIL PROTECTED]>
To: solr-user@lucene.apache.org
Sent: Thursday, March 20, 2008 3:48:28 PM
Subject: Re: Does emty fields affect index size?

Make sure you omit norms for those fields if possible.  If you do
that, the index should only be marginally bigger.

-Yonik


On Thu, Mar 20, 2008 at 3:20 PM, Evgeniy Strokin
<[EMAIL PROTECTED]> wrote:
> Hello, lets say I have 10 fields and usually some 5 of them are present in 
> each document. And the size of my index is 100Mb.
>  I want to change my schema and I'll have 100 fields, but each document will 
> still have only 5 fields present.
>  After I reindex my data, will the size be affected? Could you guess how big 
> the increase will be?
>  Any related information, suggestions will be helpful as well.
>
>  Thanks in advance,
>  Eugene

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