How to estimate the size of lucene .nrm file

[roz dev <ro...@gmail.com>]

Hi,

I want to estimate the size of .nrm 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

RE: How to estimate the size of lucene .nrm file

[Uwe Schindler <uw...@thetaphi.de>]

Hi,

The size is easy to calculate (it needs one byte per document and field):

[Number of documents] * 1 byte * [number of indexed fields with norms
enabled]

-----
Uwe Schindler
H.-H.-Meier-Allee 63, D-28213 Bremen
http://www.thetaphi.de
eMail: uwe@thetaphi.de


> -----Original Message-----
> From: roz dev [mailto:rozdev29@gmail.com]
> Sent: Saturday, September 17, 2011 7:38 PM
> To: java-user@lucene.apache.org
> Subject: How to estimate the size of lucene .nrm file
> 
> Hi,
> 
> I want to estimate the size of .nrm 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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