wrong estimation at Hash Match

In an inner join on a table with up-to-date full scan statistics the hash match estimated 2.760 rows (149K) , whereas the actuals are 544.700.285. This leads to a spill in the tempDB in a sort later on. How to investigate where this mismatch comes from and how to correct this? alt text

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avatar image By SirWilliam 1 asked Jul 14 at 09:29 AM
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avatar image Matak Jul 16 at 10:59 PM

Pictures of execution plans dont help at all. Can you attach the actual plan ?

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asked: Jul 14 at 09:29 AM

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Last Updated: Jul 16 at 10:59 PM

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