Autovacuum Daemon is Turned On by Default in Postgres 8.3.8?

Hi,

I'm looking at my log file (see my log file below) and it seems like the autovacuum daemon is turned on by default in
Postgres8.3.8.  Does that mean that I no longer need to manually invoke the autovacuum command anymore?  I used to do
itmanually in an older version of Postgres. 

tail postgresql-2010-06-02_000000.log
DEBUG:  autovacuum: processing database "template1"
DEBUG:  server process (PID 31719) exited with exit code 0
DEBUG:  autovacuum: processing database "marydatabase"
DEBUG:  server process (PID 31729) exited with exit code 0
DEBUG:  autovacuum: processing database "postgres"
DEBUG:  server process (PID 31739) exited with exit code 0
DEBUG:  autovacuum: processing database "template1"
DEBUG:  server process (PID 31741) exited with exit code 0
DEBUG:  autovacuum: processing database "marydatabase"
DEBUG:  server process (PID 31753) exited with exit code 0

Thanks
Mary