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

Magnus Hagander <magnus@hagander.net> writes:
> On Wed, Oct 14, 2020 at 3:57 PM Thomas Kellerer <shammat@gmx.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.

            regards, tom lane