Re: Doc about how to set max_wal_senders when setting minimal wal_level

On Fri, 15 Jul 2022 at 08:49, Bruce Momjian <bruce(at)momjian(dot)us> wrote:
> On Tue, Jul 5, 2022 at 08:02:33PM -0400, Tom Lane wrote:
>> "Precondition" is an overly fancy word that makes things less clear
>> not more so. Does it mean that setting wal_level = minimal will fail
>> if you don't do these other things, or does it just mean that you
>> won't be getting the absolute minimum WAL volume? If the former,
>> I think it'd be better to say something like "To set wal_level to minimal,
>> you must also set [these variables], which has the effect of disabling
>> both WAL archiving and streaming replication."
>
> I have created the attached patch to try to improve this text.

IMO we can add the following sentence for wal_level description, since
if wal_level = minimal and max_wal_senders > 0, we cannot start the database.

To set wal_level to minimal, you must also set max_wal_senders to 0,
which has the effect of disabling both WAL archiving and streaming
replication.

--
Regrads,
Japin Li.
ChengDu WenWu Information Technology Co.,Ltd.