| From: | "Bossart, Nathan" <bossartn(at)amazon(dot)com> |
|---|---|
| To: | Andres Freund <andres(at)anarazel(dot)de> |
| Cc: | Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Andrew Dunstan <andrew(dot)dunstan(at)2ndquadrant(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, "Tsunakawa, Takayuki" <tsunakawa(dot)takay(at)jp(dot)fujitsu(dot)com>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Michael Paquier <michael(at)paquier(dot)xyz>, 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>, "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: | 2019-03-04 22:20:39 |
| Message-ID: | 9AD69229-3D34-4E82-B11A-0FEB27EFBABD@amazon.com |
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| Lists: | pgsql-hackers |
On 3/4/19, 2:05 PM, "Andres Freund" <andres(at)anarazel(dot)de> wrote:
> On 2019-03-04 22:00:47 +0000, Bossart, Nathan wrote:
>> On 3/4/19, 1:44 PM, "Andres Freund" <andres(at)anarazel(dot)de> wrote:
>> > Yea, I do think that's a danger. But we allow disabling autovacuum, so
>> > I'm not sure it matters that much... And for indexes you'd still have
>> > the index page-level vacuum that'd continue to work.
>>
>> I think the difference here is that there isn't something like
>> autovacuum_freeze_max_age to force index cleanup at some point.
>> Granted, you can set autovacuum_freeze_max_age to 2B if you want, but
>> at least there's a fallback available.
>
> Well, but your cluster doesn't suddenly shut down because of index bloat
> (in contrast to xid wraparound). So I don't quite see an equivalent need
> for an emergency valve. I think we should just put a warning into the
> reloption's docs, and leave it at that.
That seems reasonable to me.
Nathan
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