The delta consistency model states that an update will propagate through the system and all replicas will be consistent after a fixed time period δ. In other words, the result of any read operation is consistent with a read on the original copy of an object except for a (short) bounded interval after a modification. So basically, if you have an object which is modified, during the short period of time following its modification, the read will not be consistent. Then, after a fixed time period, the modification is propagated and the read will be consistent.
- Communication Systems: The State of the Art : IFIP 17th World Computer Congress, Lyman Chapin ed. 2002
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