You should understand the DocValues as feature that allow you to do sorting and faceting without blow the heap.
They are not necessary faster than the traditional method, they are more memory efficient and in huge indexes this is the main limitation. This post resumes the docvalues feature and the main goals http://searchhub.org/2013/04/02/fun-with-docvalues-in-solr-4-2/ -- Yago Riveiro Sent with Sparrow (http://www.sparrowmailapp.com/?sig) On Wednesday, November 20, 2013 at 10:15 AM, Floyd Wu wrote: > Hi Yago > > Thanks for you reply. I once thought that DocValues feature is one for me > to store some extra values. > > May I summarized that DocValues is a feature that "speed up" sorting and > faceting? > > Floyd > > > > 2013/11/20 Yago Riveiro <yago.rive...@gmail.com > (mailto:yago.rive...@gmail.com)> > > > Hi Floyd, > > > > DocValues are useful for sorting and faceting per example. > > > > You don't need to change nothing in your xml's, the only thing that you > > need to do is set the docValues=true in your field definition in the schema. > > > > If you don't want use the default implementation (all loaded in the heap), > > you need to add the tag <codecFactory class="solr.SchemaCodecFactory"/> in > > the solrconfig.xml and the docValuesFormat=true on the fieldType definition. > > > > -- > > Yago Riveiro > > Sent with Sparrow (http://www.sparrowmailapp.com/?sig) > > > > > > On Wednesday, November 20, 2013 at 9:38 AM, Floyd Wu wrote: > > > > > Hi there, > > > > > > I'm not fully understand what kind of usage example that DocValues can be > > > used? > > > > > > When I set field docValues=true, do i need to change anyhting in xml > > that I > > > sent to solr for indexing? > > > > > > Please point me. > > > > > > Thanks > > > > > > Floyd > > > > > > PS: I've googled and read lots of DocValues discussion but confused.
