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
wraparoundof 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