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From Erick Erickson <erickerick...@gmail.com>
Subject Re: Size of lucene norm file
Date Sun, 18 Sep 2011 15:02:38 GMT
Here's a useful link as well:

http://lucene.apache.org/java/3_0_2/fileformats.html#file-names

Erick

On Sun, Sep 18, 2011 at 1:17 AM, roz dev <rozdev29@gmail.com> wrote:
> Norms (*.nrm)
>
> Norms are an index time normalization factor that can be factored into
> scoring. Document and field boosts as well as length normalization are
> applied with norms. When in memory, norms occupy one byte per document for
> each field with norms on, even if only one document has norms on for that
> field. The Norms file does some book keeping and stores the byte for each
> document. If you modify norms, modifications will be tracked in a new norms
> file,* seg_prefix_X.sN ,*were N is the field number, and X is the norms
> generation.
>
> http://www.lucidimagination.com/blog/2009/03/18/exploring-lucenes-indexing-code-part-2/
>
> as per this link, norms seem to be costly one
>
>
>
>
>
>
> On Sat, Sep 17, 2011 at 11:59 PM, janwen <tom.grade1986@163.com> wrote:
>
>>
>> What is NORM file?
>>
>>
>>
>>
>> On 2011-9-18 5:20, roz dev wrote:
>>
>>> Hi,
>>>
>>> I want to estimate the size of NORM file that lucene will generate for a
>>> 20
>>> Gb index which has 2.5 Million Docs and 50 fields in each document.
>>>
>>> Is there any formula to predict it?
>>>
>>> And, what is the RAM cost of this nrm file.
>>>
>>> Thanks
>>> Saroj
>>>
>>>
>>
>>
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