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Posted to java-user@lucene.apache.org by maureen tanuwidjaja <au...@yahoo.com> on 2007/03/14 04:41:56 UTC
lengthNorm accessible?
hmmm...now I wonder wheter it is possible to access this lengthNorm value so that it can be used as before but without creating any nrm file --> setOmitNorm = true
Any other suggestion on how i could get the same rank as before by making use of this lengthNorm but without creating nrm file?
Thanks,
Maureen
Xiaocheng Luan <je...@yahoo.com> wrote:
You can store the fields in the index itself if you want, without indexing them (just flag it as stored/unindexed). I believe storing fields should not incur the "norms" size problem, please correct me if I'm wrong.
Thanks,
Xiaocheng
maureen tanuwidjaja wrote: Ya...I think i will store it in the database so that later it could be used in scoring/ranking for retrieval...:)
Another thing i would like to see is whether the precision or recall will be much affaected by this...
Regards,
Maureen
Xiaocheng Luan wrote:One side-effect of turning off the norms may be that the scoring/ranking will be different? Do you need to search by each of these many fields? If not, you probably don't have to index these fields (but store them for retrieval?).
Just a thought.
Xiaocheng
Michael McCandless wrote: "maureen tanuwidjaja" wrote:
> "The only simple workaround I can think of is to set maxMergeDocs to
> keep all segments "small". But then you may have too many segments
> with time. Either that or find a way to reduce the number of unique
> fields that you actually need to store."
> It is not possible for me to reduce the number of fields needed to
> store...
>
> Could you recommend what is the maxMerge value that is small enough to
> keep all segment small?
>
> I also would like to ask wheter, if optimize is successful,will it then
> perform faster searching significantly compared to the unoptimized
> one?
I think you'd need to test different values for your situation. Maybe
try 66,000 which will give you ~ 10 segments at your current number of
docs?
> I have the searching result in 30 to 3 minutes, which is actually quite
> unacceptable for the "search engine" I build...Is there any
> recommendation on how faster searching could be done?
I think you'll need to turn off norms. I expect alot of the slowness is
in loading the large norms files for the first time.
Mike
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