What is Program Data Vector (PDV)? What are its functions? - SAS

What is Program Data Vector (PDV)? What are its functions?

- PDV is a logical area in the memory
- SAS creates a dataset one observation at a time
- Input buffer is created at the time of compilation, for holding a record from external file
- PDV is created followed by the creation of input buffer
- SAS builds dataset in the PDV area of memory
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