Lucene.Net fuzzy search speed

Question

Sorry for the concern, but I hope to get any help from Lucene-experienced people.

Now we use in our application Lucene.Net 3.0.3 to index and search by ~2.500.000 items.

Answer 1

You can improve the speed of Fuzzy Queries by setting their prefix length to a non-zero value. This will allow lucene to narrow the set of possible results efficiently. Like this:

queryParser.FuzzyPrefixLength = 2;

Also, it doesn't affect the query you've provided as an example, but if you care at all about performance, you should remove the line queryParser.AllowLeadingWildcard = false;. Leading wildcards will absolutely kill performance.