[Matthew T. O'Connor - Wed at 02:33:10PM -0400]
> In addition autovacuum respects the work of manual or cron based
> vacuums, so if you issue a vacuum right after a daily batch insert /
> update, autovacuum won't repeat the work of that manual vacuum.
I was experimenting a bit with autovacuum now. To make the least effect
possible, I started with a too high cost_delay/cost_limit-ratio. The
effect of this was that autovacuum "never" finished the transactions it
started with, and this was actually causing the nightly vacuum to not do
it's job good enough.