I'm trying to make sense of the memory usage reported by 'top', compared
to what "pg_database_size" shows. Here's one result:
Now, looking at memory use with "top", there is a lot memory that isn't
being used on the system:
Mem: 470M Active, 2064M Inact
( 3 Gigs RAM, total ).
Overall performance is decent, so maybe there's no
problem. However, I wonder if we've under-allocated memory to
PostgreSQL. (This is a dedicated FreeBSD DB server).
Some memory settings include:
shared_buffers = 8192 (we have 450 connections)
max_fsm_pages = 1250000 (we kept getting HINTs to bump it, so we did)
Maybe we should be bumping up the "sort_mem" and "vacuum_mem" as well?
I do sometimes see sorting and vacuuming as showing up as things I'd
like to run faster.
This list has been a great resource for performance tuning help, and I
continue to appreciate your help. We've used PostgreSQL on every project
we've had a choice on for the last 10 years. (Has it been that long?!)
We've never regretted it once.