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Date:         Thu, 17 Aug 2006 22:19:08 -0400
Reply-To:     "Howard Schreier <hs AT dc-sug DOT org>" <nospam@HOWLES.COM>
Sender:       "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:         "Howard Schreier <hs AT dc-sug DOT org>" <nospam@HOWLES.COM>
Subject:      Re: How slow is normal with large datasets?

It seems that some people suspect the proc and others suspect the network configuration.

I would experiment by running a do-nothing DATA step a few times against the same data set:

data _null_; set thelib.whatever; run;

That may help focus on the problem.

On Thu, 17 Aug 2006 02:56:54 -0700, Paul <ptvonhippel@CHECKFREE.COM> wrote:

>I'm analyzing a large data set wth 1.5M rows and 50 variables. With 30 >regressors, PROC LOGISTIC takes at least 15 minutes to give results -- >and can take much longer if other users are running SAS jobs as well. >It's an imbalanced data set -- a thousand ones, a million zeroes, and >sampling weights that vary from 1 to 100. The DATA step is slow, too, >so I can spend the bulk of my day just coding up a couple of new >variables and running a few regressions that use them. > >In my previous job, I did academic research using data sets that were >at least 10 times smaller. So I've learned to use SAS more efficiently >-- avoiding sorts, keeping only the variables I need, using >pass-through SQL. These make a big difference, but I just can't seem to >get the speed down to where I really feel I'm interacting with the >data. > >Do I need to accept fate, or should I be pounding the table for a >better technical setup? We're using SAS Enterprise Guide on a remote >server in another state. I'm sharing resources with up to 4 other >users. > >I'd be interested in hearing comparisons (either "That sounds about >right" or "I run more complicated analyses on larger data sets and >never have to wait more than a minute for results"). And I'd be >interested in hearing suggestions about diagnosing the problem. I'm not >sure if our connection is slow, or if it's fundamentally inappropriate >to be using EG for this purpose. Maybe I should have my own SAS >installation on my local PC? > >Best -- >Paul


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