Here are few links you can have a look at
https://www.lexjansen.com/scsug/2004/Clifford%20-%20Scalable%20Access%20to%20SAS%20Data.pdf
SAS online Docs: https://documentation.sas.com/doc/en/pgmsascdc/9.4_3.5/engspde/engspdewhatsnew94.htm
https://support.sas.com/rnd/scalability/spde/spde_setup.pdf
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