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Duplicate Leads are got when separating a large time span to several smaller ones to multi-thread data extracts

Question asked by a3e8dd2974d7d639dea937a27a8fcb3894b7b310 on Feb 18, 2014
Latest reply on Feb 18, 2014 by a3e8dd2974d7d639dea937a27a8fcb3894b7b310
Hi all,

When I get data by LeadUpdateAtSelecter on a long duration, to get records batch by batch would take too long.
So I separate the duration to five smaller ones, and do the extract actions using multi-thread.
After getting all data, I find that, in the five parts, there are several Leads appear in not only one part. So when joining them together, I get several duplicate records.
Any suggestions about this?