Hi,

I have index ~31G where

27% of the index size is .fdt files (8.5G)

20% - .fdx files (6.2G)

37% - .frq files (11.6G)

16% - .tim files (5G)

 

This is the term dictionary for 4.0's default codec (currently uses

BlockTree implementation)

.tim is the on-disk portion of the terms (similar in function to .tis

in previous releases)

.tip is the in-memory "terms index" (similar in function to .tii in

previous releases)

 

见：http://grokbase.com/t/lucene/solr-user/124ha4e1bb/solr-4-0-what-is-stored-in-tim-index-file-format