Till now I didn't hear from SAS Tech Support. I guess it is one design problem which can not be solved simply. As business unit, we must have one solution quickly. I have given up SAS by using Python json modules. The benefit is, we can multithreading python script to accelerate the process. For 2G raw data files, I can use pythong to convert to CSV format ascii file, and then load into SAS in 10 minutes. So I will close this post as solved, even not in SAS.
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