I think that Bywater post from 2012 is actually quite misleading and downright wrong in some cases but Ians comments in the listserv are good. Kohas C4::Search code needs to die in a fire François is right about QueryAutoTruncate. If I recall correctly, it actually silently turns off relevance searching. 1) The most important thing to remember is that C4::Search::_build_weighted_query() adds a bunch of stuff to the mix. The query the user makes is very very different from the one that is sent to Zebra. Add some debugging logging to Koha or monitor your Zebra server to see what queries are actually being sent to Zebra. That ByWater post says that some MARC tags are more relevant than others. Thats not really true per se. However, Koha adds several title indexes to the query and gives them high ranking weights, I believe. So its not that some MARC fields are ranked higher than others in general. Rather, Search.pm just loads up the query to favour title indexes (which are not the same thing as MARC tags anyway ) 2) Id review <http://www.indexdata.com/zebra/doc/administration-ranking.html> http://www.indexdata.com/zebra/doc/administration-ranking.html. The query is broken down into atomic parts, those atomic queries are run, hit lists are created for these atomic parts, the documents in the hit lists are scored, and then all the atomic queries are merged together to create a master hit list and the total document score is calculated. As far I know, it just uses term frequency, and not proximity (unless you tell it to also use proximity). What query did you use in yaz-client? I suspect that you didnt include ranking? If you did, it probably wasnt the same query used by Koha, unless the query weighting was being turned off (say by QueryAutoTruncate). When in doubt, figure out what Koha is sending to Zebra. That should almost always indicate whats actually going on. Check the search results to see if theyre actually in relevance order. Just look at the biblionumbers for the first 5 results. If theyre in perfect ascending/descending order, chances are that your relevance is silently turned off. David Cook Systems Librarian Prosentient Systems 72/330 Wattle St Ultimo, NSW 2007 Office: 02 9212 0899 Direct: 02 8005 0595 From: koha-devel-bounces@lists.koha-community.org [mailto:koha-devel-bounces@lists.koha-community.org] On Behalf Of Francois Charbonnier Sent: Tuesday, 22 March 2016 2:17 AM To: koha-devel@lists.koha-community.org Subject: Re: [Koha-devel] How is relevance weighted in zebra search? Hi, I'll suggest you to read this and that : http://bywatersolutions.com/2012/11/27/a-little-bit-about-relevance-in-koha/ https://lists.katipo.co.nz/public/koha/2012-February/031909.html Both helped me to understand a bit more how relevance works in Koha. And, try to desactivate the QueryAutoTruncate system preferences. It doesn't mix well with the relevance ranking. François Charbonnier, Bibl. prof. / Chef de produits Tél. : (888) 604-2627 <mailto:francois.charbonnier@inLibro.com> francois.charbonnier@inLibro.com inLibro | pour esprit libre | <http://www.inLibro.com> www.inLibro.com Le 2016-03-21 09:06, Barton Chittenden a écrit : Hi, We just upgraded a library from Koha 3.0 to 3.22. After the upgrade, the library complained that the title "Golden Age" was at the bottom of their OPAC search results. I checked the obvious first: OPACdefaultSortField had been set to 'relevance' with OPACdefaultSortOrder set to 'ascending', which would definitely be backwards (least relevant first)... I changed to to 'ascending', and got exactly the same results. Restarting memcache didn't help. When I searched using yaz-client, I found that the results that were coming first in the list had the phrase "golden age" in 520$a. Here's the version of zebra: $ idzebra-config --version 2.0.59 At this point, I have two major questions: 1) Where do I check which fields are ranked more highly in a relevance search? (I would think that title should be ranked higher than 520$a -- summary). 2) Why didn't the sort order change when I changed OPACdefaultSortOrder from ascending to descending? _______________________________________________ Koha-devel mailing list Koha-devel@lists.koha-community.org <mailto:Koha-devel@lists.koha-community.org> http://lists.koha-community.org/cgi-bin/mailman/listinfo/koha-devel website : http://www.koha-community.org/ git : http://git.koha-community.org/ bugs : http://bugs.koha-community.org/