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Date: Tue, 22 Dec 2009 15:05:15 +0300
Message-ID: <9a76536b0912220405i295390f2j94bbf482a957467f@mail.gmail.com>
Subject: Re: Lucene' results paging
From: =?UTF-8?B?0JDQvdGC0L7QvSDQmtC40YDQuNC70LvQvtCy?=
 <antonv.kirillov@gmail.com>
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Thanks for your answer. But how should I get the total nubmer of
search results in this case?

On Mon, Dec 21, 2009 at 6:51 PM, Ian Lea <ian.lea@gmail.com> wrote:
> Hi
>
>
> The standard approach to paging is just to do the search again and
> pick out the docs you want, along the lines you outline. =9AYou cannot
> pass start/end info to any search methods.
>
> When you set max doc to, say, 10, lucene will find the 10 highest
> scoring docs and return them. =9AThere is no point in passing a number
> higher than you need. =9ASo if you are displaying 10 hits per page, call
> search(query, 10) for the first page, ..., 20 for the second and pick
> out the last 10, and so on.
>
> An alternative approach is for you to cache the search results
> yourself. =9AThat way you can avoid any subsequent searches. =9ABut that
> has it's own overhead and complexity, and most people most of the time
> don't get much past the first page.
>
>
> http://wiki.apache.org/lucene-java/LuceneFAQ#How_do_I_implement_paging.2C=
_i.e._showing_result_from_1-10.2C_11-20_etc.3F
>
> --
> Ian.
>
>
> On Mon, Dec 21, 2009 at 12:26 PM, =E1=CE=D4=CF=CE =EB=C9=D2=C9=CC=CC=CF=
=D7
> <antonv.kirillov@gmail.com> wrote:
>> Hi, All! I have some problems with Lucene's search process and it's
>> results, so I hope You could help me.
>>
>> First one: how should I split results by pages? Now I get search
>> results in such way:
>>
>> TopDocs topDocs =3D is.search(finalQuery, 100000) //For example
>>
>> and after that I get the needed results in such way:
>>
>> //for example startPage =3D 20, endPage =3D 40
>> for(int j=3DstartPage; j<stopPage; j++){
>>
>> doc[j-startPage] =3D is.doc(topDocs.scoreDocs[j].doc);
>> }
>>
>> I think this is a bad approach. How should I optimize my code to make
>> search faster? Is there any possibility to set start and stop pages in
>> search methods?
>>
>> The second one:
>> After the search is completed and the results are not sorted are all
>> the results stored in search engine? I mean when I set the max number
>> of docs in method search(finalQuery, 10) equal 10. would Lucene find
>> all relevant docs, then sort them by relevance and select first ten
>> after that? Or does Lucene store some specific information in indices
>> which allows select first 10 most relevant docs without sorting all
>> million (for example) relevant pages?
>>
>> Thanks in advance.
>> --
>> Anton Kirillov
>>
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