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| Tuning Tips for Applications That Use SAS/SHARE Software |
The SAS Library Model
You should make sure you thoroughly understand the material about the SAS library model in SAS Language Reference: Concepts before you attempt to tune SAS applications and servers at your installation. Here are some of the terms defined in that material that are most important to understanding this paper:
A SAS library can have five types of members, DATA, VIEW, CATALOG, PROGRAM, ACCESS, MDDB, and FDB. This paper will deal only with the types DATA, VIEW, and CATALOG.
A library member of type DATA is a SAS data file. Through SAS 5, SAS referred to such files as SAS data sets. A SAS data file can be compressed, and it can have zero or more indexes.
A SAS data view is a set of directions that tells a SAS view engine how to combine data from one or more sources into observations.
A SAS catalog is a file that contains smaller files; the files contained in a catalog are catalog entries. Some types of entries you might be familiar with are PROGRAM (SAS/AF programs), SCREEN (PROC FSEDIT screens), and FORMAT (user-written formats).
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Copyright © 2007 by SAS Institute Inc., Cary, NC, USA. All rights reserved.