Norms information comes mainly from lengths of documents - allowing the search time scoring to take into account the effect of document lengths (actually field length within a document). In practice, norms stored within the index may include other information, such as index time boosts - for a document, for a field. A single byte is stored for each field, - so for this the actual value is compressed. At search time, norms are loaded into memory, and so consume 1 byte for each document. It is possible to disable norms for a field while indexing. This is explained better in the javadoc for Similarity, and here: http://lucene.apache.org/java/2_3_2/scoring.html
Doron On Mon, Aug 18, 2008 at 5:59 AM, blazingwolf7 <[EMAIL PROTECTED]>wrote: > > Hi, > > I am currently using Lucene for indexing. After a index a file, I will use > LUKE to open it and check the index. And there is 1 part that I am curious > about. In Luke, under the Document tab, I randomly select a document and > display it. At the bottom will be 4 columns, Field, ITSVopLBC, Norm and > String Value. > > I am wondering, what is Norm for? And where is it created during indexing > time? Which method calculates it? > > Could anyone advise me on this? Thanks for the help > -- > View this message in context: > http://www.nabble.com/Index-of-Lucene-tp19025490p19025490.html > Sent from the Lucene - Java Users mailing list archive at Nabble.com. > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > >
