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Are index scans almost as bad as table scans?

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Looking through the query plan for a problem-child procedure that Im trying to fix, I see one area that has the largest cost associated with it and its doing a index scan.  Sure enough, there is no index on the column that's being used.  

So my question is are index scans about as bad as a full table scan?

I suspect I need to add an index for the column in question...


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