> > 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.
> 
> I kind of like vadim's idea of segmenting pg_log. 
> 
> Segments in which all the xacts have been commited could be deleted.

Without undo we have to ensure that all tables are vacuumed after
all transactions related to a segment were committed/aborted.

Vadim

Mon, 6 Nov 2000 14:12:07 -0800 
"Mikheev, Vadim" <vmikheev@SECTORBASE.COM>
RE: Transaction ID wraparound: problem and proposed sol
	ution