|Date: ||Thu, 2 Jan 1997 17:39:22 -0700|
|Reply-To: ||"Raymond V. Liedka" <liedka@UNM.EDU>|
|Sender: ||"SAS(r) Discussion" <SAS-L@UGA.CC.UGA.EDU>|
|From: ||"Raymond V. Liedka" <liedka@UNM.EDU>|
|Subject: ||Re: COMPRESS Option (SAS 6.12)|
|Content-Type: ||TEXT/PLAIN; charset=US-ASCII|
On Thu, 2 Jan 1997, Devi Katikineni wrote:
> Why would anyone NOT use the COMPRESS option in SAS?
If one needed to access the data by observation number. An example is if
you are using the point= syntax in a datastep. A compressed dataset
cannot be accessed except as a "whole"; that is you cannot jump from
recored to record (like using the point= sytax).
> He found that using OPTIONS COMPRESS significantly reduces both
> the process time and the dataset size. He expected that there
> would be some overhead with the COMPRESS option, and so process
> time would be longer, but found that it was shorter??
If the compression is pretty succesful and the original data is
voluminous, then you might save a lot of time reading a much smaller file
off the floppy drive. Hard drives are just plain speedier.
> Any comments would be welcome. TIA.
> Devi Katikineni
> Social & Scientific Systems, Bethesda, MD.
Raymond V. Liedka
Department of Sociology
University of New Mexico