IRC, Lucene in Action book loops around this point almost every chapter: multifield query is faster.
On Tue, Jun 5, 2012 at 7:04 PM, Jack Krupansky <j...@basetechnology.com>wrote: > There may be a raw performance advantage to having all values in a single > combined field, but then you loose the opportunity to boost title and tag > field hits. > > With the extended dismax query parser you have the ability to specify the > field list in the "qf" request parameter so that the query can simply be > the keywords and operators without all of the extra "OR" operators. qf also > lets you specify the boost for each field. > > -- Jack Krupansky > > -----Original Message----- From: santamaria2 > Sent: Tuesday, June 05, 2012 8:50 AM > To: solr-user@lucene.apache.org > Subject: Is it faster to search over many different fields or one field > that combines the values of all those other fields? > > > Say I have various categories of 'tags'. I want a keyword search to search > through my index of articles. So I search over: > 1) the title. > 2) the body > 3) about 10 of these tag-categories. Each tag category is multivalued with > a > few words per value. > > Without considering the affect on 'relevance', and using the standard > lucene > query parser, would it be faster to specify each of these 10 fields in q (q > = cat1:keyword OR cat2:keyword OR ... ), or to copyfield the stuff in those > 10 fields into one combined field? > > Or is it such that I should be slapped in the face for even thinking about > performance in this scenario? > > -- > View this message in context: http://lucene.472066.n3.** > nabble.com/Is-it-faster-to-**search-over-many-different-** > fields-or-one-field-that-**combines-the-values-of-all-** > those-tp3987766.html<http://lucene.472066.n3.nabble.com/Is-it-faster-to-search-over-many-different-fields-or-one-field-that-combines-the-values-of-all-those-tp3987766.html> > Sent from the Solr - User mailing list archive at Nabble.com. > -- Sincerely yours Mikhail Khludnev Tech Lead Grid Dynamics <http://www.griddynamics.com> <mkhlud...@griddynamics.com>
