Hmm, IIRC it is based on a monotonically increasing number. It could have been anything. LSN was just a monotonically increasing number that would be available if WAL was implemented first (or in parallel).
You are right, but without WAL-logging we would need to implement some kind of sequence :)
-- Teodor Sigaev E-mail: teo...@sigaev.ru WWW: http://www.sigaev.ru/ -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers