Executing Only Necessary Statements
Overview
When you execute
the minimum number of statements in the most efficient order, you
minimize the hardware resources that SAS uses. The resources that
are affected include disk usage, memory usage, and CPU usage.
Here are two techniques
to keep in mind:
-
Subset your data as soon as is logically possible.
-
Process your data conditionally by using the most appropriate technique.
Positioning of the Subsetting IF Statement
To
subset your data based on a newly derived or computed variable, use
the subsetting IF statement in a DATA step in order to process only
those observations that meet a specified condition.
The subsetting IF statement causes the DATA step to continue processing only ...
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