Re: COPY with hints, rebirth
Simon Riggs <simon@2ndquadrant.com>
From: Simon Riggs <simon@2ndQuadrant.com>
To: Christopher Browne <cbbrowne@gmail.com>
Cc: PostgreSQL-development <pgsql-hackers@postgresql.org>
Date: 2012-02-29T21:19:17Z
Lists: pgsql-hackers
On Wed, Feb 29, 2012 at 6:14 PM, Christopher Browne <cbbrowne@gmail.com> wrote: > On Wed, Feb 29, 2012 at 11:14 AM, Simon Riggs <simon@2ndquadrant.com> wrote: >> But it is very effective at avoiding 4 out of the 5 writes you mention. > > For the "common case," would we not want to have (1) [WAL] and (2) > [Writing the pre-frozen tuple]? > > If we only write the tuple (2), and don't capture WAL, then the COPY > wouldn't be replicable, right? Well, my answer is a question: how would you like it to work? The way I coded it is that it will still write WAL if wal_level is set, so it would be replicable. So it only works when writing to a newly created table but is otherwise separate to whether WAL is skipped. -- Simon Riggs http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Training & Services