: 1. Does Solr have a limit, e.g a % or a number to limit the number of : document involved in sorting? or just sort all document?
it depends on the context of your question ... if you use any existing fieldtypes, then standard LUcnee sorting kicks in, and a Fieldcache is built containing the values of every doc no matter how many need to be sorted for a given query -- but that cache is reused for every sorted query. if you write your own FieldType, you can do whatever you want in your SortField implentation. : 2. Does the order in parameter 'sort' refer to the sorting order? (sort the : first argument first, then the second and so on) http://wiki.apache.org/solr/CommonQueryParameters#sort -Hoss
