Hannu Krosing <hannu(at)tm(dot)ee> writes:
>> * disk space --- letting pg_log grow without bound isn't a pleasant
>> prospect either.
> How will 2x size increase of xid cause "boundless" growth of pg_log ;)
OK, 2^64 isn't mathematically unbounded, but let's see you buy a disk
that will hold it ;-). My point is that if we want to think about
allowing >4G transactions, part of the answer has to be a way to recycle
pg_log space. Otherwise it's still not really practical.
regards, tom lane