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From Apache Wiki <>
Subject [Lucene-java Wiki] Update of "ImproveSearchingSpeed" by TokeEskildsen
Date Tue, 14 Apr 2009 11:10:53 GMT
Dear Wiki user,

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The following page has been changed by TokeEskildsen:

The comment on the change is:
Recommended profiling

   It can be much more efficient to restrict results to a part of the index using a cached
bit set filter rather than using a query clause. This is especially true for restrictions
that match a great number of documents of a large index. Filters are typically used to restrict
the results to a category but could in many cases be used to replace any query clause. One
difference between using a Query and a Filter is that the Query has an impact on the score
while a Filter does not.
+  * '''Find the bottleneck.'''
+ Complex query analysis or heavy post-processing of results are examples of hidden bottlenecks
for searches. Profiling with at tool such as [[ VisualVM]] helps
locating the problem.

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