AND vs. OR query performance

2008-05-11 Thread Lars Kotthoff
Dear list, during some performance experiments I have found that queries with ORed search terms are significantly faster than queries with ANDed search terms, everything else being equal. Does anybody know whether this is the generally expected behaviour? Thanks, Lars

Re: Loading performance slowdown at ~ 400K documents

2008-05-11 Thread Tracy Flynn
Thanks for the replies. For a completely different reason, I happened to look at the memory stats for all processes including the SOLR instances. Noticed that the SLOW Solr instance was maxing out with more virtual memory than allocated. After boosting the maximum heap space and restarting,

Re: Loading performance slowdown at ~ 400K documents

2008-05-11 Thread David Pratt
Hi Tracy. Can you advise the sort of difference in max heap space that resulted in the improvement, that is, your before and after max heap space. Many thanks. Regards, David Tracy Flynn wrote: Thanks for the replies. For a completely different reason, I happened to look at the memory stats

Re: Loading performance slowdown at ~ 400K documents

2008-05-11 Thread Alexander Ramos Jardim
Tracy, Pay attention on the new benchmarks and new jvm behavior. Changing the heap might not be solving your problem, but just delaying it from happening. 2008/5/11 David Pratt <[EMAIL PROTECTED]>: > Hi Tracy. Can you advise the sort of difference in max heap space that > resulted in the improve

Re: Solr feasibility with terabyte-scale data

2008-05-11 Thread Marcus Herou
Quick reply to Otis and Ken. Otis: After a nights sleep I think you are absolutely right about that some HPC grid like Hadoop or perhaps GlusterHPC should be used regardless of my last comment. Ken: Looked at the arch of Katta and it looks really nice. I really believe that Katta could be somethi