In reply to Chris.

Chris,

Thank you for you comment. The issue is we have several SAS customers who are adding memory to make SAS DATA steps run faster and questioning why it is not helping. That is the reason for the initial post to explain why they are seeing what they are seeing.

I am also glad you are seeing good performance using direct IO and buffers with SAS> My experience has been this does not help most customers, unless they heavily use the SAS DATA step.