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 <rozde...@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.grade1...@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 >>> >>> >> >> >> ------------------------------**------------------------------**--------- >> To unsubscribe, e-mail: >> java-user-unsubscribe@lucene.**apache.org<java-user-unsubscr...@lucene.apache.org> >> For additional commands, e-mail: >> java-user-help@lucene.apache.**org<java-user-h...@lucene.apache.org> >> >> > --------------------------------------------------------------------- To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org For additional commands, e-mail: java-user-h...@lucene.apache.org
