As said above, start chopping that CSV file on smaller chunks and experiment.
I can’t help you further unless you give me full access to the file, inform me of your exact MySQL version, what Erlang / Elixir versions you use, and give me access to the code.
You’ll have to track this down yourself because even if I was willing to help further and drill deeper, I am simply out of bandwidth to do so. That might change in just a few days or might not change for months – my work load varies.
I am pretty sure the problem is easy to solve though.
