GitHub user maxx-ukoo added a comment to the discussion: How to load big 
dataset to new database

@afs  Thanks for the update. After a few extra tests, I think I found the issue 
— I need a lot of memory for the upload. I ran everything from scratch, 
starting with a 16 GB VM and a 4 GB Java heap. After the upload speed 
decreased, I increased the memory to 32 GB, then to 64 GB. Each memory upgrade 
improved the upload speed. However, when I reduced the memory from 64 GB to 32 
GB, the upload speed decreased again. I believe memory is responsible for the 
upload speed.
I didn’t use tdb2.xloader because it can’t upload data to the named graph. 
Also, I don’t know how to provide 400–600 files as command-line arguments for 
the upload.


GitHub link: 
https://github.com/apache/jena/discussions/3701#discussioncomment-15671362

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