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Howto improve performance for queries against table without primary key without changing the query or the table directly? [closed]

UPDATE: I included some updated information in this question, because there was no way of progressing here given the previous constraints. Scroll to the bold-faced paragraphs to see my updates; I ...
4
votes
2answers
186 views

Need for reaching data through clustered index with a non-clustered index

I have found that when a table has both clustered and non-clustered indexes (on different columns), the leaf level non-clustered pages, instead of pointing to the data row, point to the node of the ...