Re: BUG #19002: `pg_isready` unexpectedly succeeds on incorrect `--dbname` and/or `--username`

On Tue, Jul 29, 2025 at 12:45 PM PG Bug reporting form
<noreply@postgresql.org> wrote:
> /  > pg_isready -U fff
> /tmp:5432 - accepting connections
> /  > pg_isready -U fff -d555
> /tmp:5432 - accepting connections
> ```
>
> (`fff` is not a user and `555` is not a db on my installation)

Hi Samuel, this behavior is explained in the docs [1]:

> It is not necessary to supply correct user name, password, or database name values to obtain the server status; however, if incorrect values are provided, the server will log a failed connection attempt.

So it's essentially just a courtesy to whoever's watching your logs.

--Jacob

[1] https://www.postgresql.org/docs/current/app-pg-isready.html#APP-PG-ISREADY-NOTES