On Thu, Jul 6, 2017 at 07:29:07AM -0700, Jim Finnerty wrote: > re: "The problem is if you want to delete from such a page. Then you need to > update the tuple's xmax and stick the new xid epoch somewhere."
I am coming to this very late, but wouldn't such a row be marked using our frozen-commited fixed xid so it doesn't matter what the xid epoch is? I realize with 64-bit xids we don't need to freeze tuples, but we could still use a frozen-commited fixed xid, see: #define FrozenTransactionId ((TransactionId) 2) -- Bruce Momjian <br...@momjian.us> http://momjian.us EnterpriseDB http://enterprisedb.com + As you are, so once was I. As I am, so you will be. + + Ancient Roman grave inscription + -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers