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6.4

Fulltext large (200.000) count query performace too slow

Asked by albertung in MS SQL Server, SQL Server 2008, SQL Server 2005

Tags: SQL Server 2005 Fulltext

Hi,

We are having too slow response times for a simple count on a fulltext in SQL Server 2005. Even using the most simple query on a good server (64 bit Dual Opteron 4GB Ram with high speed 16 raid disk storage)):

select count(*) from content_books where contains(searchData,'"english"')

Takes 4 seconds to count the avg 300.000 results

I have removed all the joins with real table data so that the query is only inside the fulltext engine..

I would expect this to be down to 10 milli seconds. Isn't it just getting the size of the "english" word result index?

It seems the engine is going through all the results because if a do a more complex search that returns less results the performance is better.

Any clues of how to do this faster? We never need to read the thousands of records BUT we ALWAYS need to count them. The 4 seconds of CPU/IO usage can't go live as it won't scale up.

Has anyone gone through this?

Thank you very much,
Filipe

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20091118-EE-VQP-93 / EE_QW_2_20070628

Fulltext large (200.000) count query performace too slow

Asked by albertung in MS SQL Server, SQL Server 2008, SQL Server 2005

Tags: SQL Server 2005 Fulltext

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