| From: | Justin Pryzby <pryzby(at)telsasoft(dot)com> |
|---|---|
| To: | Andres Freund <andres(at)anarazel(dot)de> |
| Cc: | David Rowley <dgrowleyml(at)gmail(dot)com>, Laurenz Albe <laurenz(dot)albe(at)cybertec(dot)at>, Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com>, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com>, Darafei Komяpa Praliaskouski <me(at)komzpa(dot)net>, pgsql-hackers(at)lists(dot)postgresql(dot)org, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Michael Banck <mbanck(at)gmx(dot)net> |
| Subject: | Re: Berserk Autovacuum (let's save next Mandrill) |
| Date: | 2020-03-14 00:10:00 |
| Message-ID: | 20200314001000.GT29065@telsasoft.com |
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| Lists: | pgsql-hackers |
On Fri, Mar 13, 2020 at 02:38:51PM -0700, Andres Freund wrote:
> > |One disadvantage of decreasing vacuum_freeze_min_age is that it might cause
> > |VACUUM to do useless work: freezing a row version is a waste of time if the row
> > |is modified soon thereafter (causing it to acquire a new XID). So the setting
> > |should be large enough that rows are not frozen until they are unlikely to
> > |change any more.
>
> I think the overhead here might be a bit overstated. Once a page is
Could you clarify if you mean the language in docs in general or specifically
in the context of this patch ?
--
Justin
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