Re: Can postgres run autovacuum tasks when autovacuum is disabled?

Scott Marlowe-2 wrote
> On Wed, Jul 30, 2014 at 1:12 AM, Andrey Zhidenkov <

> pensnarik@

> > wrote:
>> I'm confused about this:
>>
>> [postgres(at)srv log]$ grep autovacuum ~/data/postgresql.conf
>> autovacuum = off # Enable autovacuum subprocess? 'on'
>> log_autovacuum_min_duration = 0 # -1 disables, 0 logs all actions and
>> autovacuum_naptime = 10min # time between autovacuum runs
>>
>> So, as you can see, autovacuum is disabled now and I could not seen any
>> autovacuum tasks about few hours. But now
>> I can see this:
>>
>> srv=# select backend_start, query from pg_stat_activity where query ilike
>> '%vacuum%';
>> backend_start |
>> query
>> -------------------------------+---------------------------------------------------------------------------------
>> 2014-07-29 21:38:42.882383+04 | select backend_start, query from
>> pg_stat_activity where query ilike '%vacuum%';
>> 2014-07-30 10:21:51.5511+04 | autovacuum: VACUUM ANALYZE
>> customer_email
>> 2014-07-30 10:43:19.49936+04 | autovacuum: VACUUM ANALYZE cdr_tech
>> (3 rows)
>>
>> The problem is that table cdr_tech is very large (70Gb) and I couldn't
>> wait
>> while autovacuum is finished, I would like to run vacuum manually at
>> night
>> time.
>>
>> Whan I do wrong?
>
> Are you sure these aren't to prevent wrap-around?

This is my other theory, and probably the correct one. Is this something
that can be discovered from the logs (since nothing in the query provides
this detail)?

David J.

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