MS SQL Coldfusion fine tuning query?

Using lower on the indexed column will cause MS SQL to not use your index. That could cause a significant performance hit in a table of your size. You should make sure the UID is always lower case when you insert it, or can try this: lower function on indexed column.

In your case, you are searching against an email field, which is most of the time full of lower case characters than uppercase. So converting to lower case can (tests will tell you) speed up things.

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