Seeing as how this is probably a one-shot, I might just select data in the main loop, and feed it to Amazon in parallel processes. It shouldn't take ALL that long to select 70G of data. The bottleneck, I would think, would be the Amazon request. Something like:
while ( my $records = fetch_next_5000_records_from_sth() ) {
$runner->run( ..feed records to Amazon... );
)
Update: And it looks like you really only feed one record at a time to the web service, so it might as well be:
while ( my $record = $sth->fetch() ) {
$runner->run(... feed record to service ...);
}
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