The added IO is one factor. Another is the CPU load from doing many
edit-distance comparisons between index terms and the provided search
term. You can limit the number of edit distance comparisons conducted by
setting the minimum prefix length. This is a property of the QueryParser
if parsing queries and a property of FuzzyQuery if constructing
programatically.
>>P.S. arent' there any "best practices" for lucene?
Yes. The front page of the the WIKI has a "Basics of Performace". I've
added a note on FuzzyQueries to the "ImproveSearchingSpeed" page
Cheers
Mark
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