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List:       lucene-user
Subject:    Re: sorted search
From:       Erik Hatcher <erik () ehatchersolutions ! com>
Date:       2005-02-24 18:08:34
Message-ID: be6e34fac4db17c9a0faa972cb787cb3 () ehatchersolutions ! com
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Sorting by String uses up lots more RAM than a numeric sort.  If you 
use a numeric (yet lexicographically orderable) date format (e.g. 
YYYYMMDD) you'll see better performance most likely.

	Erik


On Feb 24, 2005, at 1:01 PM, Yura Smolsky wrote:

> Hello, lucene-user.
>
> I have index with many documents, more than 40 Mil.
> Each document has DateField (It is time stamp of document)
>
> I need the most recent results only. I use single instance of 
> IndexSearcher.
> When I perform sorted search on this index:
>       Sort sort = new Sort();
>       sort.setSort( new SortField[] { new SortField ("modified", 
> SortField.STRING, true) } );
>       Hits hits =
>         searcher.search(QueryParser.parse("good", "content",
>                                           StandardAnalyzer()), sort);
>
> then search speed is not good.
>
> Today I have tried search without "sort by modified", but with sort by
> Relevance. Speed was much better!
>
> I think that Sort by DateField is very slow. Maybe I do something
> wrong about this kind of sorted search? Can you give me advices about
> this?
>
> Thanks.
>
> Yura Smolsky.
>
>
>
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