Michael Paquier <michael@paquier.xyz> writes:
> Requoting my previous message that you did not include:
>> There may be an argument about somebody enforcing a new
>> TOAST_OID_MAX_CHUNK_SIZE or EXTERN_TUPLES_PER_PAGE manually, of
>> course, but while we claim that tweaks are possible in heaptoast.h,
> I've never seen anybody actually do that. So yes, I agree that if
> somebody has the idea to change this value manually, the control file
> value makes sense to keep. It's just that I doubt that anybody is
> actually doing that. :)
Perhaps not, but the point of these disk-layout-compatibility fields
in pg_control is to keep people from shooting themselves in the foot.
I don't think it's that unlikely that someone would decide that four
TOAST tuples per page isn't ideal, especially if they were running
with non-default BLCKSZ.
regards, tom lane
