>Hi,
> I am having Customer ID as primary key for my customer table. I found that, it is slow for searching a customer record using either LOCATE FOR or SQL-SELECT. Therefore, I set Customer ID as regular key in table as well. It really optimized the query. The speed of search is just like "light of speed".
>
>Why could it happen?
>

Did the primary key have a FOR clause in it? If so, Rushmore won't use the index for optimization. If you removed the FOR clause when coverting to a regular index, that's probably the reason.