On Tue, May 21, 2013 at 1:03 PM, Amit Langote <amitlangot...@gmail.com>wrote:
> On Wed, May 22, 2013 at 12:07 AM, Rodrigo Barboza > <rodrigombu...@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." > > http://www.postgresql.org/docs/9.3/static/runtime-config-resource.html > > -- > Amit Langote > So what would it be a reasonable value? 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.
