> > The IB 5.5 documentation describes a sweep being triggered when:
> >
> > "... the difference between the OIT and the newest transaction reaches the threshold."

Also i should note, that actually sweep is triggered when difference between just re-calculated numbers of "oldest snapshot of all active transactions" (OST) and "oldest interesting transaction" (OIT) reaches the sweep interval value :

// If the transaction block is getting out of hand, force a sweep

if (dbb->dbb_sweep_interval &&
!(tdbb->getAttachment()->att_flags & ATT_no_cleanup) &&
(trans->tra_oldest_active - trans->tra_oldest > dbb->dbb_sweep_interval) &&
oldest_state != tra_limbo)
{
start_sweeper(tdbb, dbb);
}

This was not changes since FB1.

Regards,
Vlad