Re: [BUGS] 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-AFTERsuggests 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
mentionsthat 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
>
>


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