The tools in the IML that support R will allow you move data between SAS datasets and R data frames.
That makes me believe they are limited in size to the amount of memory that the R process can use.
There are tools from Teradata that allow you to create data frames that keep the data in the database. I am not sure if the SAS interface to R would work with that implementation of R, but I don't see why it wouldn't.
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