Re: [HACKERS] Re: pgsql: Make CheckRequiredParameterValues() depend upon correct

Robert Haas <robertmhaas@gmail.com> writes:
> On Fri, Apr 23, 2010 at 4:44 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
>> A design that might work is
>> (1) store the active value of wal_mode in pg_control (but NOT as part of
>> the last-checkpoint-record image).
>> (2) invent a new WAL record type that is transmitted when we change
>> wal_mode.

> Well, right now wal_mode would only be able to be changed at server
> restart.

Right, but slave servers won't find out about the change until the first
checkpoint after the start.  Which is Too Late.

			regards, tom lane