On Fri, 2011-01-21 at 11:19 +0200, Heikki Linnakangas wrote: > On 21.01.2011 11:10, Simon Riggs wrote: > > So any xid that commits in a different sequence to the order in which > > the xid was assigned creates a potential for unserialization? Or? > > It's not the order in which the xid was assigned that matters, but the > order the transactions started and got their snapshots. The xids might > be assigned a lot later, after the transactions have already read data.
So if a read-write transaction assigns an xid before it takes a snapshot then we'll be OK? That seems much easier to arrange than passing chunks of snapshot data backwards and forwards. Optionally. -- Simon Riggs http://www.2ndQuadrant.com/books/ PostgreSQL Development, 24x7 Support, Training and Services -- Sent via pgsql-hackers mailing list (firstname.lastname@example.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers