Bruce,
We never actually considred undo, but high UPDATE activity was one of
the areas we historically handled poorly compared to undo systems, and
undo would have been one way to improve that area. I think with HOT we
have improved high UPDATE activity enough that the undo benefits are no
longer attractive (and of course the undo disadvantages were never
attractive).
If you're asking if we should remove the TODO (is there one?) and
replace it with a FAQ item called "Why PostgreSQL doesn't have an UNDO
LOG", then my vote is "yes".
--Josh
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