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What is the Program Data Vector (PDV) and What are its
functions?
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Answer Posted / kanya
When a data step is submited,it is first compiled and then
executed.During the compilation phase,after cheking the
syntax an input buffer and PDV are created.The PDV is a
logical area in memory where sas built a data set,one
observation at a time.It is a temporary holding area.Along
with computed data set variables ,the pdv contains the 2
automatic variables: _N_, _NULL_
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