st 14. 10. 2020 v 17:10 odesílatel Tom Lane <tgl@xxxxxxxxxxxxx> napsal:
Magnus Hagander <magnus@xxxxxxxxxxxx> writes:
> On Wed, Oct 14, 2020 at 3:57 PM Thomas Kellerer <shammat@xxxxxxx> 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
