| From: | Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com> |
|---|---|
| To: | Michael Paquier <michael(at)paquier(dot)xyz> |
| Cc: | "Tsunakawa, Takayuki" <tsunakawa(dot)takay(at)jp(dot)fujitsu(dot)com>, Julien Rouhaud <rjuju123(at)gmail(dot)com>, Laurenz Albe <laurenz(dot)albe(at)cybertec(dot)at>, "Jamison, Kirk" <k(dot)jamison(at)jp(dot)fujitsu(dot)com>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Fujii Masao <masao(dot)fujii(at)gmail(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: reloption to prevent VACUUM from truncating empty pages at the end of relation |
| Date: | 2019-02-25 06:59:21 |
| Message-ID: | CAD21AoDozzGm7HY5iSKxHBs110XKcZoQnk7YofQ3LLRiVw3rDg@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Mon, Feb 25, 2019 at 3:56 PM Michael Paquier <michael(at)paquier(dot)xyz> wrote:
>
> On Mon, Feb 25, 2019 at 02:38:05AM +0000, Tsunakawa, Takayuki wrote:
> > From: Julien Rouhaud [mailto:rjuju123(at)gmail(dot)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
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