Date:         Sat, 3 May 2003 03:07:09 -0400
Reply-To:     Thomasset Pierre <pierre.thomasset@EURONET.BE>
Sender:       "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:         Thomasset Pierre <pierre.thomasset@EURONET.BE>
Subject:      Re: Index

As far as I know, SAS data sets have only secondary indexes, and no primary
index.

The primary index (usually the data set identifier = unique value per
observation), should remain logically sorted + indexed, even after
insertion of new observations. Primary index should be accessible
sequentially or via index file.

Secondary indexes remain indexed after insertion of new observations.
Secondary indexes are accessible only via index file.

Regards.