On Fri, 2008-03-28 at 11:26 -0300, Alvaro Herrera wrote: > Simon Riggs wrote: > > On Fri, 2008-03-28 at 10:35 -0300, Alvaro Herrera wrote: > > > > > The problem is that we always consider every transaction's PGPROC->xid > > > in calculating MyProc->xmin. So if you have a long running > > > transaction, it doesn't matter how far beyond the snapshots are -- the > > > value returned by GetOldestXmin will always be at most the old > > > transaction's Xid. Even if that transaction cannot see the old rows > > > because all of its snapshots are way in the future. > > > > It may not have a TransactionId yet. > > How is this a problen? If it ever gets one, it will be in the future.
Yeh, that was my point. So the problem you mention mostly goes away. -- Simon Riggs 2ndQuadrant http://www.2ndQuadrant.com PostgreSQL UK 2008 Conference: http://www.postgresql.org.uk -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
