Re: \watch 0 or \watch 0.00001 doesn't do what I want

On 09/10/2024 16:38, Heikki Linnakangas wrote:
> Daniel's post [1] on \watch reminded me of this little issue I bumped into:
>
> I wanted to run a query in a tight loop, without any delay. I tried
> "\watch 0", but it didn't do what I wanted:
>
> postgres=# \watch 0

Correction: This changed in version 16. It works the way I expected on
v16, but not in earlier versions.

> Then I tried setting the delay really small, but that didn't do what I wanted either:
>
> postgres=# \watch 0.00001
> Wed 09 Oct 2024 16:36:45 EEST (every 1e-05s)
>
> ?column?
> ----------
> 1
> (1 row)
>
> ^C
>
> It runs the query just once and then hangs forever, until I hit CTRL-C to cancel.

This issue is present on newer versions still.

--
Heikki Linnakangas
Neon (https://neon.tech)