Elliot Chance <elliotchance(at)gmail(dot)com> writes:
> Wouldn't that mean at some point it would be advisable to be using 64bit transaction IDs? Or would that change too much of the codebase?
It's not so much "too much of the codebase" as "nobody wants another 8
bytes added to per-row overhead". Holding a transaction open for
circa 2G transactions would be disastrous anyway, because of table bloat
from inability to reclaim dead rows.
regards, tom lane