Compilation Phase
Input Buffer
At
the beginning of the compilation phase, the input buffer (an area
of memory) is created to hold a record from the external file. The
input buffer is created only when raw data is read, not when a SAS
data set is read.
Program Data Vector
After the input buffer is created, the program data vector is
created. The program data vector is the area of memory where SAS
holds one observation at a time.
The
program data vector contains two automatic variables that can be
used for processing but which are not written to the data set as
part of an observation.
-
_N_ counts the number of times that the DATA ...
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