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SQL Server covering index and key lookup performance

April 15, 2012 by Andy Hayes 7 Comments

covering index key lookup

In this post, I wanted to write about the covering index and key lookup and how adding covering indexes can help increase performance by reducing lookups to the table data. It's helpful to know what each of these terms mean and then we will look at an example scenario further down the post. What is a covering index? A covering index is a non-clustered index which includes … [Read more...] about SQL Server covering index and key lookup performance

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