| From: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> |
|---|---|
| To: | Sergei Kornilov <sk(at)zsrv(dot)org> |
| Cc: | "Nasby, Jim" <nasbyj(at)amazon(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, Robert Haas <robertmhaas(at)gmail(dot)com>, Michael Paquier <michael(at)paquier(dot)xyz>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: pgsql: Improve autovacuum logging for aggressive and anti-wraparound ru |
| Date: | 2018-09-24 21:11:17 |
| Message-ID: | 20180924211117.tpwxemzd3372nagj@alvherre.pgsql |
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On 2018-Sep-24, Sergei Kornilov wrote:
> Hi
>
> > An autovacuum can't be just aggressive; it's either anti-wraparound or normal.
> But autovacuum _can_ be aggressive and not anti-wraparound.
> I build current master and can see 3 different line types:
> 2018-09-24 23:47:31.500 MSK 27939 @ from [vxid:4/272032 txid:0] [] LOG: automatic aggressive vacuum of table "postgres.public.foo": index scans: 0
> 2018-09-24 23:49:27.892 MSK 28333 @ from [vxid:4/284297 txid:0] [] LOG: automatic aggressive vacuum to prevent wraparound of table "postgres.public.foo": index scans: 0
> 2018-09-24 23:49:29.093 MSK 28337 @ from [vxid:4/284412 txid:0] [] LOG: automatic vacuum of table "postgres.public.foo": index scans: 0
Exactly.
It cannot be anti-wraparound and not aggressive, which is the line type
not shown.
"Aggressive" means it scans all pages; "anti-wraparound" means it does
not let itself be cancelled because of another process waiting for a
lock on the table.
--
Álvaro Herrera https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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