Re: Ideal configuration for postgresql 9.3 config

Hi Oliver,

I have suggested a few changes below.

On Tue, Feb 16, 2016 at 7:15 PM, Oliver Jagape <oliver(dot)jagape(at)concentrix(dot)com
> wrote:

> CPU: 16 cores
>
> RAM: 48GB
>
> Disk for Data is at a fiber channel SAN storage.
> max_connections = 1024
>

If you need that many concurrent connections, invest in a connection
pooler. If no connection pooler is used, knock off 800 connections if you
can.

> shared_buffers = 8000MB
>

Test with a lower setting like 4GB, depending on your workload, that may or
may not perform better.

> work_mem = 4096MB
>

This magnitudes too high. It is per query * sort and aggregation steps. If
you expect queries with large result sets (or distinct, group by, etc),
100MB is probably a reasonable starting point.

> maintenance_work_mem = 512MB
>

Depending on your relation size, you might want to double this.

> checkpoint_segments = 512
>

Is that a reason you chose such a high number?

> enable_nestloop = off
>

Unless you have a clear reason to disable this (it applies to all queries),
leave this enabled.

> autovacuum = off
>

autovacuum should be on unless you know your data churn patterns and have
scheduled manual vacuums.

> autovacuum_naptime = 60
>

You probably want that more aggressive, like 5s.