"Kevin Grittner" <kevin.gritt...@wicourts.gov> wrote: > (1) A read write transaction might need to be canceled to > prevent the view of the data a committed read only transaction has > already seen from becoming inconsistent. (Dan's example) And this one seems entirely a theoretical possibility. I spent a little time looking it over, and I don't see how it could be made to work from hot standbys without an unbounded flow of predicate lock information from all standbys to the master *plus* blocking commits on the master for the duration of the longest round trip latency to any standby. I think we can call this one dead on arrival. -Kevin
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