| From: | "Tsunakawa, Takayuki" <tsunakawa(dot)takay(at)jp(dot)fujitsu(dot)com> |
|---|---|
| To: | 'Alvaro Herrera' <alvherre(at)2ndquadrant(dot)com> |
| Cc: | 'Michael Paquier' <michael(at)paquier(dot)xyz>, 'Robert Haas' <robertmhaas(at)gmail(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>, "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: | 2019-02-28 08:16:14 |
| Message-ID: | 0A3221C70F24FB45833433255569204D1FBBB922@G01JPEXMBYT05 |
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| Lists: | pgsql-hackers |
From: Alvaro Herrera [mailto:alvherre(at)2ndquadrant(dot)com]
> Robert used the phrase "attractive nuisance", which maybe sounds like a
> good thing to have to a non native speaker, but it actually isn't -- he
> was saying we should avoid a GUC at all, and I can see the reason for
> that. I think we should have a VACUUM option and a reloption, but no
> GUC.
Uh, thanks. I've just recognized I didn't know the meaning of "nuisance." I've looked up the meaning in the dictionary. Nuisance is like a trouble maker...
Why do you think that it's better for VACUUM command to have the option? I think it's a table property whose value is determined based on the application workload, not per VACUUM execution. Rather, I think GUC is more useful to determine the behavior of the entire database and/or application.
If we want to change a given execution of VACUUM, then we can ALTER TABLE SET, VACUUM, and ALTER TABLE SET back.
Regards
Takayuki Tsunakawa
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