Hi @NN,
We have customers running this on AIX. You don't mention the version of PostgreSQL you are using or the maintenance level of SAS (M<and some number>). This information is important in diagnosing the issue.
Make sure that you are using a supported version of PostgreSQL. Here is a screenshot from the SAS Systems Requirements for SAS 9.4 on AIX. Your best bet may be to contact tech support.
UPDATE: SAS 9.4M6 requires a Hot Fix (H3J001) to be installed to get access to use BULKUNLOAD=.
![SAS_Postgres_systems_requirements.png SAS_Postgres_systems_requirements.png](https://communities.sas.com/t5/image/serverpage/image-id/49138i8E19CD7EA693B392/image-size/large?v=v2&px=999)
This SAS Communities article may be of assistance - An Insider's Guide to SAS and Database Support Information.
Best wishes,
Jeff
"Who used to be the product manager for SAS/ACCESS"