On Wed, May 22, 2013 at 12:07 AM, Rodrigo Barboza <rodrigombufrj@gmail.com> wrote: > Hi, everyone. > I have a doubt. > I have a 32-bit postrgesql running with 2.5gb of shared_buffer. > And I have maintenance_work_mem = 1gb and autovacuum_max_workers = 3. > How maintenance_work_mem is related to shared_buffer?
They are independent settings.
> If the 3 workers uses 1gb, will the database crash?
Documentation does warn about not setting it (maintenance_work_mem) too high:
"Note that when autovacuum runs, up to autovacuum_max_workers times this memory may be allocated, so be careful not to set the default value too high."
Because I saw some people suggesting to set it to total_mem / 8.
In my case I am running a 32 bit postgres with 64gb of total memory. My kernel is 64 bits (I know that is not ideal, but that's what I have now) to recognize and use the to total memory.