: > I'm surprised, as you are, by the non-linearity. Out of curiosity, what is
Unless the data in "stored" fields is significantly greater then "indexed" fields the Index size almost never grows linearly with the number of documents -- it's the number of unique terms that tends to primarily influence the size of the index. At some point someone on the java-user list who really understood the file formats wrote a really great forumla for estimating the size of the index assuming some ratios of unique terms per doc, but i can't find it now. -Hoss
