Error: "Out of memory while reading tuples." in pushing table from SAS to PostgreSQL on Mac

I'm passing rows from SAS to PostgreSQL (I assign a libname and use a PROC APPEND).  This works fine with smaller tables (~below 1 million rows).  However, as tables get larger I receive the following error messages:

and

I've tried to change memory settings on the PostgreSQL server, but can't solve the problem.  As far as I could understand—I'm new to PostgreSQL ;)—it seems that PostgreSQL want to somehow read information on the whole table before processing it and this behavior could eventually be switched off, but I might be wrong here. 

FYI: 

- I run SAS 9.4 on a windows machine.  

- I run PostgreSQL server on a MAC: PostgreSQL 9.3.5 on x86_64-apple-darwin12.5.0, compiled by Apple LLVM version 5.1, 64-bit

  I've Pgadmin 1.18.1 installed. 

Any help would be much appreciated!!

THANKS!

PS: For several reasons, I cannot use the bulkload feature in SAS for this job.