Re: Unexpectedly high disk space usage RESOLVED (Manual reindex/vacuum)

On Sat, Nov 10, 2012 at 2:12 PM, Jeff Janes <jeff.janes@gmail.com> wrote:
> On Fri, Nov 9, 2012 at 5:56 PM, Scott Marlowe <scott.marlowe@gmail.com> wrote:
>>
>> As well, since the default nap time is 1 minute, it will take at least
>> 50 minutes to vacuum each db as nap time is how long autovac waits
>> between databases.
>
> That isn't how it works.  The naptime is per database, not per
> cluster.  If the naptime is 1 minute and there are 50 "active"
> databases, then it will launch a new worker every 1.2 seconds
> (assuming the old ones finish fast enough that doing so would not
> exceed autovacuum_max_workers)

Hmmm.  That was not my understanding from previous discussions on nap time.