Tom Lane wrote:
> Bruce Momjian <bruce@momjian.us> writes:
> > The second idea is the idea of having one parameter depend on another.
> > Not only could we do that for some of our existing parameters, but we
> > could have pseudo-parameters like concurrent_queries, memory_usage, and
> > extra_disk_space that could be at the top of postgresql.conf and then
> > affect the other settings.
>
> We have tried to do that in the past, and it didn't work well *at all*.
We have? When?
> The idea has a fundamental logical flaw, which is that it's not clear
> which parameter wins if the user changes both.
Yes, you could get into problems by having variable dependency loops,
but I see no way to easily improve configuration without it.
My idea was to have:
memory_usage = 128MB ## pseudo-parametershared_buffers = $memory_usage * 0.75
-- Bruce Momjian <bruce@momjian.us> http://momjian.us EnterpriseDB
http://enterprisedb.com
+ If your life is a hard drive, Christ can be your backup. +
