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?
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Snippets of code should be wrapped in
<code> tags not
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Want more info? How to link
or How to display code and escape characters
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