Re: [BUGS] BUG #3326: Invalid lower bound of autovacuum_cost_limit

Alvaro Herrera wrote:
> Tom Lane wrote:
>> Alvaro Herrera <alvherre@commandprompt.com> writes:
>>> But this is misleading (started postmaster with good value, then edited
>>> postgresql.conf and entered "-2"):
>>> 17903 LOG:  received SIGHUP, reloading configuration files
>>> 17903 LOG:  -2 is outside the valid range for parameter "autovacuum_vacuum_cost_limit" (-1 .. 1000)
>>> Note how it still says the range is -1 .. 1000.
>> Can we redefine things to make zero be the "disabled" value, thus
>> keeping the range of valid values contiguous?
>
> That would be another solution ... though it would be different from the
> valid value for autovacuum_vacuum_cost_delay (on which 0 is a valid
> value).  Also it would be a different value from previous versions.
>
> I don't think either of these is a showstopper, so let's go for that if
> nobody objects.

Can you make 0 and -1 both valid disabled values?  That way it will be
compatible with previous releases.