I've gone with batching 100k rows at a time Goes fast enough (for now), but I'll keep the pre-size thing in mind for future ref.

Even with 100k rows at a time, pre-sizing the array would probably show a measurable performance improvement due to the removal of the need for doubling and copying. And it won't cost you anything.

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In reply to Re^2: Out of Memory selecting from MySQL by BrowserUk
in thread Out of Memory selecting from MySQL by chrism01

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