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From: Erik Hatcher <erik@ehatchersolutions.com>
Subject: Re: sorted search
Date: Thu, 24 Feb 2005 13:08:34 -0500
To: "Lucene Users List" <lucene-user@jakarta.apache.org>

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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