On 5/26/2010 4:11 PM, Dimitri Fontaine wrote:
So even ordering the txid and txid_snapshots with respect to WAL commit time (LSN) won't be the whole story, for any given transaction containing more than one event we also need to have them in order. I know Jan didn't forget about it so it must either be in the proposal or easily derived, too tired to recheck.
No, that detail is actually not explained in the proposal. When applying all changes in transaction commit order, there is no need for a global sequence. A local counter per backend is sufficient because the total order of <xact-commit-order>, <local-xact-seq> yields a similarly agreeable order of actions.
Jan -- Anyone who trades liberty for security deserves neither liberty nor security. -- Benjamin Franklin -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
