Tim Peters wrote at 2003-9-11 23:50 -0400:
 > ...
 > You can google on the phrase to get a ton of more-or-less abstract overviews
 > of the concept.  The short course in ZODB is that, when MVCC is in effect, a
 > read will return the state of the object as of the time the current
 > transaction began, even if the object has subsequently been modified by some
 > other transaction.

Whoever wants to use it right now: the "no more ReadConflictErrors"
patch on


does precisely this (for storages that support history information).


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