Re: Problems with autovacuum and vacuum

2010/12/30 JotaComm <jota(dot)comm(at)gmail(dot)com>

> Hello,
>
> Last week I had a serious problem with my PostgreSQL database. My
> autovacuum is OFF, but in September it started to prevent the transaction
> wraparoud; however last week the following message appeared continuously in
> my log:
>
> WARNING: database "production" must be vacuumed within 4827083 transactions
>
> HINT: To avoid a database shutdown, execute a full-database VACUUM in
> "production".
>
> This message appeared for five to six hours; after that, the message
> disappeared from log. Any idea about what could have happened?
>
>

probably another "wraparaund-forced" autovacuum worker did the job, so the
warnings disappeared

> Every day the vacuum is executed on some tables; and on Sundays it's
> executed on all tables. But as the autovacuum is running since September,
> and it runs for a long time, the vacuum was blocked because autovacuum had
> been running on the same table. How should I procede in this case?
>

hmm. single vacuum process runs for more than 3 months on a table with
1000000000 rows?
this is ... less than 128 rows/second, not good.

I would rather terminate this old process, and start a VACUUM VERBOSE when
the database is less loaded.

How many INS/UPD/DEL you have on this table?

PS. When you fix this, enable autovacuum, to avoid more problems...