On 04/02/2014 12:32 AM, Stefan Keller wrote:
It also mentions an insert-only technique: "This approach has been adopted before in POSTGRES [21] in 1987 and was called "time-travel". I would be interested what "time-travel" is and if this is still used by Postgres.
Back in the old days, PostgreSQL never deleted any tuples. Rows were deleted by writing the deletion time into a column. As a result, you could go back to old data just by telling PostgreSQL to report rows which where visible at a given time.
Obviously, this approach precluded use of PostgreSQL in many scenarios. For example, you wouldn't want to use it as your web application session store.
-- Florian Weimer / Red Hat Product Security Team -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
