On Mon, Apr 12, 2010 at 6:41 AM, Heikki Linnakangas
<heikki.linnakangas@enterprisedb.com> wrote:
>> Why is standby_keep_segments used even if max_wal_senders is zero?
>> In that case, ISTM we don't need to keep any WAL files in pg_xlog
>> for the standby.
>
> True. I don't think we should second guess the admin on that, though.
> Perhaps he only set max_wal_senders=0 temporarily, and will be
> disappointed if the the logs are no longer there when he sets it back to
> non-zero and restarts the server.
If archive_mode is off and max_wal_senders = 0, then the WAL that's
being generated won't be usable for streaming anyway, right?
I think this is another manifestation of the problem I was complaining
about over the weekend: there's no longer a single GUC that controls
what type of information we emit as WAL. In previous releases,
archive_mode served that function, but now it's much more complicated
and, IMHO, not very comprehensible.
http://archives.postgresql.org/pgsql-hackers/2010-04/msg00509.php
...Robert
