Re: [PERFORM] autovacuum disk IO

Hi

2016-03-02 16:25 GMT+01:00 Artem Tomyuk <admin(at)leboutique(dot)com>:

> Hi.
>
> I've noticed that autovac. process worked more than 10 minutes, during
> this zabbix logged more than 90% IO disk utilization on db volume....
>
> ===========>29237 2016-03-02 15:17:23 EET 00000 [24-1]LOG: automatic vacuum of table "lb_upr.public._reference32": index scans: 1
> pages: 0 removed, 263307 remain
> tuples: 298 removed, 1944753 remain, 0 are dead but not yet removable
> buffer usage: 67814 hits, 265465 misses, 15647 dirtied
> avg read rate: 3.183 MB/s, avg write rate: 0.188 MB/s
> *system usage: CPU 5.34s/6.27u sec elapsed 651.57 sec*
>
> Is it possible to log autovac. io impact during it execution?
> Is there any way to limit or "nice" autovac. process?
>
> Thanks to all for any help.
>
>
maybe offtopic - there is known problem of Zabbix. Any limits for vacuum
are usually way to hell.

But more times the partitioning helps to Zabbix

https://www.zabbix.org/wiki/Higher_performant_partitioning_in_PostgreSQL

Regards

Pavel