just set the rows to a very large number, larger than the number of documents available
useful to set the fl parameter with the fields required to avoid memory problems, if each document contains a lot of information ----- Original Message ----- From: "stefan maric" <stefan.ma...@bt.com> To: solr-user@lucene.apache.org Sent: Wednesday, 10 February, 2010 2:14:05 PM Subject: RE: How to not limit maximum number of documents? Egon If you first run your query with q=<query>&rows=0 Then your you get back an indication of the total number of docs <result name="response" numFound="53" start="0"/> Now your app can query again to get 1st n rows & manage forward|backward traversal of results by subsequent queries Regards Stefan Maric -----Original Message----- From: ego...@gmx.de [mailto:ego...@gmx.de] Sent: 10 February 2010 14:08 To: solr-user@lucene.apache.org Subject: Re: How to not limit maximum number of documents? Hi Stefan, you are right. I noticed this page-based result handling too. For web pages it is handy to maintain a number-of-results-per-page parameter together with an offset to browse result pages. Both can be done be solr's 'start' and 'rows' parameters. But as I don't use Solr in a web context it's important for me to get all results in one go. While waiting for answers I was working on a work-around and came across the LukeRequestHandler (http://wiki.apache.org/solr/LukeRequestHandler). It allows to query the index and obtain meta information about it. I found a parameter in the response called 'numDocs' which seams to contain the current number of index rows. So I was now thinking about first asking for the number of index rows via the LukeRequestHandler and then setting the 'rows' parameter to this value. Apparently, this is quite expensive as one front-end query always leads to two back-end queries. So I'm still searching for a better way to do this! Cheers, Egon -------- Original-Nachricht -------- > Datum: Wed, 10 Feb 2010 13:19:05 +0000 > Von: stefan.ma...@bt.com > An: solr-user@lucene.apache.org > Betreff: RE: How to not limit maximum number of documents? > I was just thinking along similar lines > > As far as I can tell you can use the parameters start & rows in > combination to control the retrieval of query results > > So > http://<host>:<port>/solr/select/?q=<query> > Will retrieve up to results 1..10 > > http://<host>:<port>/solr/select/?q=<query>&start=11&rows=10 > Will retrieve up results 11..20 > > So it is up to your application to control result traversal/pagination > > > Question - does this mean that > http://<host>:<port>/solr/select/?q=<query>&start=11&rows=10 > Runs the query a 2nd time > > And so on > > > Regards > Stefan Maric -- GRATIS für alle GMX-Mitglieder: Die maxdome Movie-FLAT! Jetzt freischalten unter http://portal.gmx.net/de/go/maxdome01
