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Re: Record row count and execution time into table?

From: IANAL_VISTA <IANAL_Vista_at_hotmail.com>
Date: Sun, 02 Oct 2005 16:46:45 GMT
Message-ID: <Xns96E3637D0A943SunnySD@68.6.19.6> 





Niall Litchfield <Niall.litchfield_at_dial.pipex.com> wrote in 
news:43400A9E.8030009_at_dial.pipex.com:



> www.twisted-nail.com wrote:


>> Hi,
>> 
>> Counting the rows in the table is performed by full table scan. 




> 

> Unless it is done via an index. bitmap or normal indexes can, but don't 

> necessarily, provide the best access path for a count(*).

> 




Since NULLs are not stored in an index, the results might not be 100% 
accurate if the index is used to generate the COUNT.
Received on Sun Oct 02 2005 - 11:46:45 CDT












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