| SAS/GRAPH Software: Reference |
In the
SAS System, procedures use engines to access data. Characteristics
of these engines vary; generally, they allow SAS procedures to access a data
library in a particular way - the expected format for the SAS data file,
the type of read/write activity that can occur in SAS data files, and so on.
In most cases, you use the default engine for the current SAS version and
do not specify an engine. If you are using an engine other than the default,
the engine must
- support nonsequential access
- equate observation numbers with internal record
IDs (required for the GREDUCE procedure only)
- disallow shared update or spin a copy of the data
set for input processing when a procedure requires multiple passes over the
data.
Note: The default engine for Versions
7 and 8 do not work with the GREDUCE procedure if the input data set is compressed. ![[cautionend]](../common/images/cautend.gif)
For more information about SAS engines, see SAS Language Reference:
Concepts.
Copyright 1999 by SAS Institute Inc., Cary, NC, USA. All rights reserved.
