Re: reloption to prevent VACUUM from truncating empty pages at theend of relation

On Mon, Feb 25, 2019 at 3:56 PM Michael Paquier <michael@paquier.xyz> wrote:
>
> On Mon, Feb 25, 2019 at 02:38:05AM +0000, Tsunakawa, Takayuki wrote:
> > From: Julien Rouhaud [mailto:rjuju123@gmail.com]
> >> One last thing, I think we should at least add one regression test for
> >> this setting.  The one you provided previously seems perfectly suited.
> >
> > Thanks, added.
>
> +SELECT pg_relation_size('reloptions_test');
> + pg_relation_size
> +------------------
> +             8192
> +(1 row)
> This makes the test page-size sensitive.  While we don't ensure that
> tests can be run with different page sizes, we should make a maximum
> effort to keep the tests compatible if that's easy enough.

Also, I think that this test may fail in case where concurrent
transactions are running. So maybe should not run it in parallel to
other tests.

Regards,

--
Masahiko Sawada
NIPPON TELEGRAPH AND TELEPHONE CORPORATION
NTT Open Source Software Center