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iTechForums » Databases » MS SQL »

What do foreign keys do to performance in MS SQL Server 2005?

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Old 05-06-2008, 04:51 PM
Adam D Adam D is offline
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What do foreign keys do to performance in MS SQL Server 2005?
I am trying to figure out what performance impact having a foreign key relationship between two tables on integer fields has to stored procedures?

Any help would be appreciated!
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Old 05-06-2008, 04:51 PM
shellanswerman shellanswerman is offline
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Foreign keys ding your performance during inserts, or any updates to the column containing the key. The query engine has to make sure the key exists in the other table, times each row being updated or inserted.
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