Re: Cost Model

Dear David
I have read documentation that you send, but it has only sequential page
cost and random page cost parameters. What I need, would be a model of
custo for Differentiate Read/Write (sequential and random), because in SSDs
the reads and writes have different costs. If you or someone knows a patch
or other solution, that allows you to configure individual parameters to:

- Sequential reading page cost
- cost of the random reading page
- sequential recording page cost
- Random recording page cost

Best Regards
Neto

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2017-12-20 15:35 GMT-02:00 David G. Johnston <david(dot)g(dot)johnston(at)gmail(dot)com>:

> On Wed, Dec 20, 2017 at 10:29 AM, neto brpr <netobrpr(at)gmail(dot)com> wrote:
>
>> Any comment, hint about it or something, please inform me.
>>
>
> The docs contain this - its seem to cover what you describe:
>
> ​https://www.postgresql.org/docs/10/static/runtime-config-
> query.html#RUNTIME-CONFIG-QUERY-CONSTANTS
>
> David J.
>
>