TermQuery and ConstantScoreQuery on TermsFilter

[Shelly_Singh <Sh...@infosys.com>]

Hi,

In my index lucene index, I want to search on a field, but the score or order of returned documents is not important. What is important is which documents are returned.

As, I do not need score or even default sorting(order  by docid), what is the best way to write a query.

I compared performance of two options - TermQuery and ConstantScoreQuery on TermsFilter. I was expecting smaller search time with ConstantScoreQuery with TermsFilter, but it has turned out otherwise.
Please help me understand this behavior.

Thanks and Regards,

Shelly Singh
Center For KNowledge Driven Information Systems, Infosys
Email: shelly_singh@infosys.com<ma...@infosys.com>
Phone: (M) 91 992 369 7200, (VoIP)2022978622




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Re: TermQuery and ConstantScoreQuery on TermsFilter

[Ian Lea <ia...@gmail.com>]

Hard to say - there are many factors involved in searching.  I'd just
use the easiest queries that were fast enough.  If you want a better
answer more info would be useful.  For starters:

What version of lucene.
How big is the index.
How many hits.
Exactly what do the queries look like (q.toString()).
How are you constructing the filters.
Are the filters cached.

And don't forget to ignore the times of the first few searches on a
new Searcher.


--
Ian.


On Wed, Aug 18, 2010 at 12:47 PM, Shelly_Singh <Sh...@infosys.com> wrote:
> Hi,
>
> In my index lucene index, I want to search on a field, but the score or order of returned documents is not important. What is important is which documents are returned.
>
> As, I do not need score or even default sorting(order  by docid), what is the best way to write a query.
>
> I compared performance of two options - TermQuery and ConstantScoreQuery on TermsFilter. I was expecting smaller search time with ConstantScoreQuery with TermsFilter, but it has turned out otherwise.
> Please help me understand this behavior.
>
> Thanks and Regards,
>
> Shelly Singh
> Center For KNowledge Driven Information Systems, Infosys
> Email: shelly_singh@infosys.com<ma...@infosys.com>
> Phone: (M) 91 992 369 7200, (VoIP)2022978622
>
>
>
>
> **************** CAUTION - Disclaimer *****************
> This e-mail contains PRIVILEGED AND CONFIDENTIAL INFORMATION intended solely
> for the use of the addressee(s). If you are not the intended recipient, please
> notify the sender by e-mail and delete the original message. Further, you are not
> to copy, disclose, or distribute this e-mail or its contents to any other person and
> any such actions are unlawful. This e-mail may contain viruses. Infosys has taken
> every reasonable precaution to minimize this risk, but is not liable for any damage
> you may sustain as a result of any virus in this e-mail. You should carry out your
> own virus checks before opening the e-mail or attachment. Infosys reserves the
> right to monitor and review the content of all messages sent to or from this e-mail
> address. Messages sent to or from this e-mail address may be stored on the
> Infosys e-mail system.
> ***INFOSYS******** End of Disclaimer ********INFOSYS***
>

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