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  • I think you misunderstand bitsets; you want a marker of one bit per record not the whole record. Commented Apr 28, 2017 at 18:00
  • The question suggested that we wanted to find already present differences. And doing 2 billion separate queries/updates, even over time, is more than needed. This was a suggestion how you could go over your data once and print out the difference Commented Apr 29, 2017 at 5:08