>>Hi,
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>>When I make a field to be a Primary key (the field is Int type and Identity is set ON), SQL server creates a KEY named PK_Table_Name and at the same time it creates a Unique Non-Clustered index of the same name (e.g. PK_Table_Name). Will SQL use this index when optimizing searches that include the PK field?
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>>The reason I am asking is that I noticed that - somehow - when I was creating the table I created a separate Non-Unique and Non-Clustered Index On the same fields (which is the PK field). Therefore, my question is, would it be Ok to delete this "extra" index that I created?
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>>TIA
>
>That it makes the primary key clustered automatically is probably a bad move. The key has no meaning. Performance may be enhanced by clustering on another field.

Huh?? A clustered key won't be created automatically unless you specify it as such.