Re: Parameter value from (mb/gb) to bytes

st 14. 10. 2020 v 17:10 odesílatel Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> napsal:

> Magnus Hagander <magnus(at)hagander(dot)net> writes:
> > On Wed, Oct 14, 2020 at 3:57 PM Thomas Kellerer <shammat(at)gmx(dot)net> wrote:
> >> select pg_size_bytes(setting) * 8192
> >> from pg_settings
> >> where name = 'shared_buffers';
>
> > Actually, it doesn't have to be in 8k pages, that depends on the build
> > options. So if you want to be perfectly correct, you should probably
> > multiply with current_setting('block_size') instead of a hardcoded 8192
> :)
>
> It's fairly annoying that this doesn't work:
>
> regression=# select pg_size_bytes(setting||' '||unit) from pg_settings
> where name = 'shared_buffers';
> ERROR: invalid size: "16384 8kB"
> DETAIL: Invalid size unit: "8kB".
> HINT: Valid units are "bytes", "kB", "MB", "GB", and "TB".
>
> Maybe we should teach pg_size_bytes to cope with that.
>

"8kB" is strange unit - maybe we can introduce new - "page"

> regards, tom lane
>
>
>