Hi Ian, thank you for your quick response. I am running Lucene on Ubuntu 10.04, 64 bit. I switched from MMapDirectory to NIOFSDirectory without any significant changes in performance. The Lucene version running is 3.0.2. I followed your advice and opened the IndexSearcher after I added all documents to the index. Now, the search performance is slow, too.
I am indexing a vast amount of the Open Directory Project; in particular 60,000 categories with about 1,400,000 documents. Each document is represented by the short description made available bei ODP. Finally, the index on hard disk is rather small---408 MBytes. Regarding the NumericRangeQuery: It's true that I am only interested in an exact match. However I found on some forum, that one can use the NumericRangeQuery for exact matches as well without any performance loss. Nevertheless, I am willing to learn how such an exact match can be don more efficiently. While searching with Lucene, I pose about 100 queries like in my first post for each category. Last but not least, I installed VisualVM as an Eclipse Plugin. But I am not familiar with it and need to play with it a little bit. Ian Lea wrote: > > Do the fast searches that you get while the app is running use the > searcher you create before you add all the docs to the index? Surely > that won't see the added docs. > > There are general tips on speeding up searches at > http://wiki.apache.org/lucene-java/ImproveSearchingSpeed. There are > some gotchas with MMapDirectory depending on your OS and whether you > are 32 or 64 bit - see the javadocs. What are you running? What > happens when you use a standard disk based directory rather than MMap? > How many docs are you adding? How big is the index? What version of > lucene are you using? > > Your NumericRangeQuery doesn't look much like a range but I doubt > that's the problem. > > Finally, you could run a profiler to see where the time is being spent. > > > -- > Ian. > -- View this message in context: http://lucene.472066.n3.nabble.com/IndexSearch-very-slow-after-reopening-the-index-tp1699711p1699956.html Sent from the Lucene - Java Users mailing list archive at Nabble.com. --------------------------------------------------------------------- To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org For additional commands, e-mail: java-user-h...@lucene.apache.org
