Date:         Thu, 16 May 2002 06:47:45 -0500
Reply-To:     Gregg Snell <gsnell@DATASAVANTCONSULTING.COM>
Sender:       "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:         Gregg Snell <gsnell@DATASAVANTCONSULTING.COM>
Subject:      Re: storage space problems
Content-Type: text/plain; charset="iso-8859-1"

Ulrike,

Unless you have a particularly slow system, compression should actually
speed things up just a bit.  The following sentence can be found in
OnlineDoc under "Overview of Techniques for Optimizing I/O"

You can reduce the number of data accesses by processing more data each time
a device is accessed by setting the BUFNO=, BUFSIZE=, CATCACHE=, and
COMPRESS= system options.

Although it will increase the amount of cpu time required for each job.

Regards,

Gregg P. Snell
Data Savant Consulting
(913) 638-4640
(208) 977-1943 fax
http://www.datasavantconsulting.com


"Ulrike Grömping" <ugroempi@FORD.COM> wrote in message
news:3CE39136.A8C8812C@ford.com...
> This compression suggestion sounds interesting. I'm already quite at the
> limit with deleting unused files etc. I'm just wondering whether
> compressed files will be accessible a lot slower than uncompressed ones
> ?
>
> Regards, Ulrike
>
> > ...
> > There is another trick to decrease space, which you should try: use the
> > option COMPRESS=YES. That might reduce your dataset-sizes to less than
50%.
> > If you have SAS V8, you can try COMPRESS=BINARY; that is more efficient.
> > The only problem is: you cannot direct access obs if the dataset is
> > compressed. But there is normally no situation where you need it!
>
>