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In the context of a database, optimisation refers to the process of the query optimiser selecting an efficient physical execution plan.

4
votes
In what situations is varchar(max) preferred Commenters have addressed this point in detail already. I'd say that VARCHAR(MAX) generally makes sense if you are 100% sure that the column will never n …
answered Jul 10 '15 by Geoff Patterson
9
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In this case, the non-clustered index is essentially a duplicate of the primary key*. It will take up extra space and make inserts/updates/deletes slower, but it will not add any benefit. The reason …
answered Oct 13 '15 by Geoff Patterson