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You caught my comment whilst it was being drafted; I did state another reason for the approach I suggested.

Memory is almost never a problem nowadays unless you're running it on your 15 year old PC, but 300k rows * 64 k per row (19GB??) may give some pause for thought. Time to go shopping for more memory or increase your cache. :-)

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In reply to Re^3: Split a file based on column by space_monk
in thread Split a file based on column by brad_nov

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