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
