Ron Johnson wrote:
> Does PG set up buffers at the postmaster level or the database level?
>
> If at the database level, then you'll be allocating memory to
> databases that might not be in use at any one time, thus wasting it.
> One database buffer pool would make more efficient use of RAM.
Shared memory is allocated at the cluster level.
See
http://www.postgresql.org/docs/current/static/runtime-config-resource.ht
ml#RUNTIME-CONFIG-RESOURCE-MEMORY
Yours,
Laurenz Albe
