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From "Burton-West, Tom" <>
Subject RE: Total number of terms in an index?
Date Tue, 27 Jul 2010 16:27:29 GMT
Hi Jason,

Are you looking for the total number of unique terms or total number of term occurrences?

Checkindex reports both, but does a bunch of other work so is probably not the fastest.

If you are looking for total number of term occurrences, you might look at contrib/org/apache/lucene/misc/
If you are just looking for the total number of unique terms, I wonder if there is some low
level API that would allow you to just access the in-memory representation of the tii file
and then multiply the number of terms in it by your indexDivisor (default 128). I haven't
dug in to the code so I don't actually know how the tii file gets loaded into a data structure
in memory.  If there is api access, it seems like this might be the quickest way to get the
number of unique terms.  (Of course you would have to do this for each segment).

-----Original Message-----
From: Chris Hostetter [] 
Sent: Monday, July 26, 2010 8:39 PM
Subject: Re: Total number of terms in an index?

: Sorry, like the subject, I mean the total number of terms.

it's not stored anywhere, so the only way to fetch it is to actually 
iteate all of the terms and count them (that's why LukeRequestHandler is 
slow slow to compute this particular value)

If i remember right, someone mentioned at one point that flex would let 
you store data about stuff like this in your index as part of the segment 
writing, but frankly i'm still not sure how that iwll help -- because you 
unless your index is fully optimized, you still have to iterate the terms 
in each segment to 'de-dup' them.


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