Can you give some background information of the problem at hand?

What database do you use? What does the query look like?

Restructuring a massive array and writing CSV files sounds costly. What pattern? How many CSV files?

Profiling a (small) subset of the data might give some indication. Did you time how long the various steps take?

In short: could you show some code please?

In reply to Re: Processing ~1 Trillion records by dHarry
in thread Processing ~1 Trillion records by aossama

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