The following table summarizes the names and extensions of the files in Lucene: +
| Name | +Extension | +Brief Description | +
|---|---|---|
| Segments File | +segments.gen, segments_N | +Stores information about segments | +
| Lock File | +write.lock | +The Write lock prevents multiple IndexWriters from writing to the same file. | +
| Compound File | +.cfs | +An optional "virtual" file consisting of all the other index files for systems + that frequently run out of file handles. | +
| Fields | +.fnm | +Stores information about the fields | +
| Field Index | +.fdx | +Contains pointers to field data | +
| Field Data | +.fdt | +The stored fields for documents | +
| Term Infos | +.tis | +Part of the term dictionary, stores term info | +
| Term Info Index | +.tii | +The index into the Term Infos file | +
| Frequencies | +.frq | +Contains the list of docs which contain each term along with frequency | +
| Positions | +.prx | +Stores position information about where a term occurs in the index | +
| Norms | +.nrm (pre 2.1: .f[0-9]*) | +Encodes length and boost factors for docs and fields | +
| Term Vector Index | +.tvx | +Stores offest into the document data file | +
| Term Vector Documents | +.tvd | +Contains information about each document that has term vectors | +
| Term Vector Fields | +.tvf | +The field level info about term vectors | +
| Deleted Documents | +.del | +Info about what files are deleted | +
The field index, or .fdx file.
@@ -1179,7 +1261,7 @@+
@@ -1251,7 +1333,7 @@ The term dictionary is represented as two files:The term infos, or tis file.
@@ -1340,7 +1422,7 @@+
The term info index, or .tii file.
@@ -1679,7 +1761,7 @@ field basis. It consists of 3 files.The Document Index or .tvx file.
For each document, this stores the offset into the document data (.tvd) and field @@ -1694,7 +1776,7 @@
FieldPosition --> UInt64 (offset in the .tvf file)
The Document or .tvd file.
This contains, for each document, the number of fields, a list of the fields with term vector info and finally a list of pointers to the field information in the .tvf @@ -1716,7 +1798,7 @@
The .tvd file is used to map out the fields that have term vectors stored and where the field information is in the .tvf file.
The Field or .tvf file.
This file contains, for each field that has a term vector stored, a list of the terms, their frequencies and, optionally, position and offest information.
Index: docs/fileformats.pdf =================================================================== --- docs/fileformats.pdf (revision 806654) +++ docs/fileformats.pdf (working copy) @@ -5,10 +5,10 @@ /Producer (FOP 0.20.5) >> endobj 5 0 obj -<< /Length 1131 /Filter [ /ASCII85Decode /FlateDecode ] +<< /Length 1170 /Filter [ /ASCII85Decode /FlateDecode ] >> stream -Gb!$G>Ar4L'S,*:'n2t,lM6m,1eh/sOI3V];q&ErH_=b[1e:^SmJ-F^SRBL>MUN@CI/k'*a5=FKY*-WU0a34r"Hp_(WOLO\J`Qk6,l]QSec,]*+:TNVXMKtVLWsr7-n`:]#p]9%n7FTm=^uko5>JMpphQ5VFOf#&cAVA&gg5M<+Shh:&QcG\*mFco"'Rqc@;j+Tq/0nJf=S=^Z_]Z5"IQlE)WMB;>b.0S+0,3Wp!ka'f[$ld.n/%!*![=kk@$d.JHS?_G]b-HDC7s/[Cij%BW$1=5s+c)TH1^tVgQTZi#mPL]tfa+FatmY#:ST`6$)oo/CH($dlcq"opD5%'fPZ'/#QkhK