Re: backend_flush_after bytes/pages

Hello,

does
backend_flush_after = 7
mean 7 bytes or seven pages? https://www.postgresql.org/docs/9.6/static/runtime-config-resource.html#GUC-BACKEND-FLUSH-AFTER suggests it means 7 bytes, which is not the reality. The documentation is misleading.

Greetings
Dilian

On 02/07/17 19:57, Andres Freund wrote:
> Hi,
>
> On 2017-02-07 19:40:45 +0100, Дилян Палаузов wrote:
>> doc/src/smgl/config.sgml: line 2049 for postgres 9.6 states: "Whenever more than backend_flush_after bytes have been written...", which suggests that the data is interpreted as bytes. However the by initdb generated postgresql.conf file mentions that backend_flush_after is in pages, and pg_settings says the unit is 8kB.
>
>> Please rephrase doc/src/smgl/config.sgml to state, that the unit for
>> backend_flush_after is not bytes, but pages.
>
> You can configure it in bytes though, so I don't really think that
> matters?
>
> Regards,
>
> Andres
>
>