Got Isidor's answer as I was writing my own, and that's exactly what I was writing. Usually you'll be using Filters on an already filtered results set (after a first query which doesn't match all has been executed), and will be using them to apply a more complex approach for filtering result, which you couldn't have done otherwise (at least with ease).
BTW, you also should be looking into dropping the use of QueryParser unless you're expecting a text query directly from the user. Building the query using the Query derived classes would be way faster if your format isn't too complex. Itamar. -----Original Message----- From: Isidor Zeuner [mailto:cluc...@quidecco.de] Sent: Monday, September 14, 2009 7:40 PM To: clucene-developers@lists.sourceforge.net Subject: Re: [CLucene-dev] Finding a specific document in the index Hi Mike, > > All records have a "tag" field containing the word "tag", that's why > I'm searching for tag:tag (to find all records and then apply filters). > > Is there a better way to do this? Because that way, it's so slow that > we can't consider using that system in production. > Searches for a term matching all documents is almost always the worst solution. In your case, it leads to first retrieving all documents, and checking if they match the filter one-by-one. A more efficient approach (and one I'm using successfully myself) is to run a BooleanQuery to match the two index fields PK and TYPE, and taking out tag:tag from the query altogether. This way, the indexing on the two terms will be used, so no CPU cycles at all will be used for documents matching neither PK nor TYPE. Best regards, Isidor ---------------------------------------------------------------------------- -- Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ CLucene-developers mailing list CLucene-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/clucene-developers ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ CLucene-developers mailing list CLucene-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/clucene-developers
