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https://issues.apache.org/jira/browse/LUCENENET-109?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12566158#action_12566158
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Digy commented on LUCENENET-109:
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This happens mostly when the indexreader(indexsearcher) is reopened with every
search.
DIGY
> Severe search performance drop in case of sorting on ID fields
> ---------------------------------------------------------------
>
> Key: LUCENENET-109
> URL: https://issues.apache.org/jira/browse/LUCENENET-109
> Project: Lucene.Net
> Issue Type: Bug
> Reporter: Nitin Shiralkar
>
> Severe search performance drop in case of sorting on ID fields. I am using a
> lucene index where if I query for documents (500 result set) with sorting on
> document date field, then I get a resposne in ~2000 ms. However for the same
> query with sorting on Document Id field, then I get a response in ~4500 ms.
> This drop in search performance is even more severe on larger index.
> Lucene Index:
> 1. Document count: ~1000,000
> 2. Index size: > 8 GB
> Search Query:
> document_subtype:1.1201
> Lucene Search API:
> topDocs = indexSearcher.Search (userQuery, null, m_nMaximumRecordSetSize,
> sortField );
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