Re: COPY with hints, rebirth - Mailing list pgsql-hackers

From Simon Riggs
Subject Re: COPY with hints, rebirth
Date
Msg-id CA+U5nMJSfsKPkJvCSD7VOB363qjRmDMon__oSeOTtuvUEZKHEg@mail.gmail.com
Whole thread Raw
In response to Re: COPY with hints, rebirth  (Christopher Browne <cbbrowne@gmail.com>)
List 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


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