When
an object is dereferenced, the liveCache data
area that contains the before-images of persistent objects must satisfy the consistent
view of the instance.
Before-images are sorted according to their age, from old to new.
Normally, only those before-images that are no longer accessed by a consistent view are deleted.
In exceptional cases, memory problems can cause before-images that could still be accessed to be deleted.
In these cases, liveCache can no longer retrieve the requested view of the instance.
The older the consistent view, the greater the likelihood of this phenomenon-
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