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Date:         Tue, 11 Nov 2003 13:17:09 -0500
Reply-To:     Sigurd Hermansen <HERMANS1@WESTAT.COM>
Sender:       "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:         Sigurd Hermansen <HERMANS1@WESTAT.COM>
Subject:      Re: DATA step utilizing an oracle index
Comments: To: Shaun <Shaun.Carlson@WELLCARE.COM>
Content-Type: text/plain

Shaun: You don't specify the WHERE conditions that might benefit from an index. Assuming that Oracle index improves a SQL query invoked in the Oracle shell, you should be able to get virtually the same improvement in a SAS SQL 'pass-thru' query of the form:

Connect to Oracle <connection string> ;

proc sql; create table <SAS dataset name> as select * from CONNECTION TO ORACLE(select <Oracle table column list> from <Oracle DB table/view reference> where .... ) ; quit;

SAS SQL passes it directly to the Oracle DB system. Oracle executes it there and returns the yield of the query. SAS SQL materializes the yield of a query as a dataset or data stream (when executed as a view). Sig

-----Original Message----- From: Shaun [mailto:Shaun.Carlson@WELLCARE.COM] Sent: Tuesday, November 11, 2003 12:08 PM To: SAS-L@LISTSERV.UGA.EDU Subject: DATA step utilizing an oracle index

I am fairly new SAS user, and I am querying a rather large database (tens of millions of records) to pull based on a few criteria. The query took much longer than I expected from a SAS process (15-20 minutes), so I sent my query to the DBA so he could index the table. I just got a reply from him saying the index has been created and analyzed, so I re-ran the process. It is still taking just as long.

Do I have to give SAS a special command so that it knows there is an index it can make use of? My data step is very simple:

data _dataset_; set _oracletable_( keep = _fields_I'm_interested_in_ ); where _conditions_; run;

Thanks for any help you can offer.


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