Обсуждение: Vacuum never completed....
We had a server approach wraparound yesterday on a 9.3 box. I restarted in single user mode and only one table was above autovacuum_freeze_max_age. The dataset was ~750G. We left vacuum running for 21hrs and it still did not complete. What was interesting is that disk IO graph kept cycling, lots of reads for ~45min, then a few writes for another 45min. I failed to VACUUM VERBOSE so there was little other data to go on other than IO graph. We ended dropping the table and lowering autovacuum_freeze_max_age for clean up. We've had similar sized dataset complete vacuum in a few hours, but I've never seen this cycling IO before: https://imagebin.ca/v/2eIdB2bjFBxq Is this normal? It gave me very little faith that VACUUM would ever complete.
On Apr 19, 2016 6:37 AM, <rolf@winmutt.com> wrote:
>
> We had a server approach wraparound yesterday on a 9.3 box. I restarted in single user mode and only one table was above autovacuum_freeze_max_age. The dataset was ~750G. We left vacuum running for 21hrs and it still did not complete. What was interesting is that disk IO graph kept cycling, lots of reads for ~45min, then a few writes for another 45min.
What kind of indexes were on the table?
Cheers,
Jeff
btree. On 2016-04-19 06:53, Jeff Janes wrote: > On Apr 19, 2016 6:37 AM, <rolf@winmutt.com> wrote: >> >> We had a server approach wraparound yesterday on a 9.3 box. I > restarted in single user mode and only one table was above > autovacuum_freeze_max_age. The dataset was ~750G. We left vacuum > running for 21hrs and it still did not complete. What was interesting > is that disk IO graph kept cycling, lots of reads for ~45min, then a > few writes for another 45min. > > What kind of indexes were on the table? > > Cheers, > > Jeff