| From: | Andres Freund <andres(at)anarazel(dot)de> |
|---|---|
| To: | Rob Sargent <robjsargent(at)gmail(dot)com> |
| Cc: | "pgsql-generallists(dot)postgresql(dot)org" <pgsql-general(at)lists(dot)postgresql(dot)org>, "pgsql-performance(at)lists(dot)postgresql(dot)org" <pgsql-performance(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: amazon aroura config - seriously overcommited defaults? (May be Off Topic) |
| Date: | 2018-12-08 23:38:18 |
| Message-ID: | 20181208233818.qu5k5bb4mjklzcqw@alap3.anarazel.de |
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| Thread: | |
| Lists: | pgsql-general pgsql-performance |
On 2018-12-08 15:23:19 -0800, Rob Sargent wrote:
>
>
> > On Dec 8, 2018, at 3:12 PM, Andres Freund <andres(at)anarazel(dot)de> wrote:
> >
> > On 2018-12-08 12:06:23 -0800, Jeremy Schneider wrote:
> >> On RDS PostgreSQL, the default is 25% of your server memory. This seems
> >> to be pretty widely accepted as a good starting point on PostgreSQL.
> >
> > FWIW, I think it's widely cited, but also bad advice. 25% for a OLTP
> > workload on a 1TB machine with a database size above 25% is a terrible
> > idea.
> >
>
> Sorry, could you please expand “database size above 25%”? 25% of what?
Memory available to postgres (i.e. 100% of the server's memory on a
server dedicated to postgres, less if it's shared duty).
Greetings,
Andres Freund
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