From: Square Bob <square_bob@yahoo.com>
To: pgsql-performance@lists.postgresql.org
Subject: Re: amazon aroura config - seriously overcommited defaults? (May be Off Topic)
Date: Sun, 9 Dec 2018 08:20:51 -0700
Message-ID: <84bcf9cf-f6b6-41ab-3e67-cdd149dc7331@yahoo.com> (raw)
In-Reply-To: <fa3376e8-fe4b-de59-47ce-2fc79d40eb53@2ndQuadrant.com>
References: <a053cc2d-bf74-cd33-09e1-024b7e87b494@yahoo.com>
<51a1e143-a679-d525-90a1-3fa8abecaf00@amazon.com>
<20181208231242.t66zpocct36m4o46@alap3.anarazel.de>
<7AF20599-CCD4-43D9-962D-3EB7B3E25122@gmail.com>
<20181208233818.qu5k5bb4mjklzcqw@alap3.anarazel.de>
<fa3376e8-fe4b-de59-47ce-2fc79d40eb53@2ndQuadrant.com>
On 12/9/18 5:51 AM, Andrew Dunstan wrote:
>
> On 12/8/18 6:38 PM, Andres Freund wrote:
>> On 2018-12-08 15:23:19 -0800, Rob Sargent wrote:
>>>
>>>> On Dec 8, 2018, at 3:12 PM, Andres Freund <andres@anarazel.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).
>>
>
>
> I think the best advice these days is that you need to triangulate to
> find the best setting for shared_buffers. It's very workload
> dependent, and there isn't even a semi-reliable rule of thumb.
Any advice, approaches to triangulating shared_buffers you can share
would be most helpful
>
>
> cheers
>
>
> andrew
>
>
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Subject: Re: amazon aroura config - seriously overcommited defaults? (May be Off Topic)
In-Reply-To: <84bcf9cf-f6b6-41ab-3e67-cdd149dc7331@yahoo.com>
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