Hi - I don't think you'll see a "performance hit" using a DB for your synonym configuration as opposed to a text file.
The configuration is only done once (at startup) - or when you "reload". You won't be reloading every minute, will you? After reading the configuration, the synonyms are available to Solr via the SynonymFilter object (at least as I understand it from looking at the code). The reload feature actually sounds quite neat - it will reload "in the background", and "switch in" the newly read configuration when it's ready - so hopefully no down-time waiting for configuration. Med venlig hilsen / Best regards Peter Kirk E-mail: mailto:p...@alpha-solutions.dk -----Original Message----- From: Ravi Gidwani [mailto:ravi.gidw...@gmail.com] Sent: 11. januar 2010 22:43 To: solr-user@lucene.apache.org; noble.p...@gmail.com Subject: Re: Synonyms from Database Thanks all for your replies. I guess what I meant by Query time, and as I understand solr (and I may be wrong here) I can add synonyms.txt in the query analyser as follows: <analyzer type="query"> <tokenizer class="solr.WhitespaceTokenizerFactory"/> <filter class="solr.SynonymFilterFactory" synonyms="synonyms.txt" ignoreCase="true" expand="true"/> .... </analyzer> By this my understanding is , even if the document (at index time) has a word "mathematics" and my synonyms.txt file has: mathematics=>math,maths, a query for "math" will match "mathematics". Since we have the synonyms.txt in the query analyzer. So I was curious about the database approach on similar lines. I get the point of the performance, and I think that is a big NO NO for this approach. But the idea was to allow changing the synonyms on the fly (more like adaptive synonyms) and improve the hits. I guess the only way (as Otis suggested) is to rewrite the file and reload configuration (as Peter suggested). This might be a performance hit (rewrite the file) and reload, but I guess still much better than the reading from DB ? Thanks again for your comments. ~Ravi. 2010/1/10 Noble Paul നോബിള് नोब्ळ् <noble.p...@corp.aol.com> > On Sun, Jan 10, 2010 at 1:04 PM, Otis Gospodnetic > <otis_gospodne...@yahoo.com> wrote: > > Ravi, > > > > I think if your synonyms were in a DB, it would be trivial to > periodically dump them into a text file Solr expects. You wouldn't want to > hit the DB to look up synonyms at query time... > Why query time. Can it not be done at startup time ? > > > > > > Otis > > -- > > Sematext -- http://sematext.com/ -- Solr - Lucene - Nutch > > > > > > > > ----- Original Message ---- > >> From: Ravi Gidwani <ravi.gidw...@gmail.com> > >> To: solr-user@lucene.apache.org > >> Sent: Sat, January 9, 2010 10:20:18 PM > >> Subject: Synonyms from Database > >> > >> Hi : > >> Is there any work done in providing synonyms from a database > instead of > >> synonyms.txt file ? Idea is to have a dictionary in DB that can be > enhanced > >> on the fly in the application. This can then be used at query time to > check > >> for synonyms. > >> > >> I know I am not putting thoughts to the performance implications of this > >> approach, but will love to hear about others thoughts. > >> > >> ~Ravi. > > > > > > > > -- > ----------------------------------------------------- > Noble Paul | Systems Architect| AOL | http://aol.com > No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.725 / Virus Database: 270.14.133/2612 - Release Date: 01/11/10 08:35:00
