Re: pg_ctl idempotent option

On Tue, Jan 15, 2013 at 10:25:23AM -0500, Tom Lane wrote:
> Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> writes:
> > Vik Reykja escribi:
> >> On Mon, Jan 14, 2013 at 4:22 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> >>> Idempotent is a ten-dollar word. Can we find something that average
> >>> people wouldn't need to consult a dictionary to understand?
>
> >> I disagree that we should dumb things down when the word means exactly what
> >> we want and based on the rest of this thread is the only word or word
> >> cluster that carries the desired meaning.
>
> I'm not quite convinced that it means *exactly* what we want. The
> dictionary definition, according to my laptop's dictionary, is "denoting
> an element of a set that is unchanged in value when multiplied or
> otherwise operated on by itself". I'm well aware that computer people
> often use it to mean "an operation that doesn't change the system state
> if the state is already what's wanted", but I think that's probably an
> abuse of the mathematical usage. And in any case, I'm not sure that
> non-hackers would immediately recognize the term, nor be enlightened by
> their dictionaries. But ...

I have heard idempotent used several times by our folks, and I didn't
know what it meant either. I figured it was a "strong item". ;-) I
just looked it up.

--
Bruce Momjian <bruce(at)momjian(dot)us> http://momjian.us
EnterpriseDB http://enterprisedb.com

+ It's impossible for everything to be true. +