autovacuum

[Alp UYANIK <alp@xxxxxxxxxxxxxxx>]

i have PostgreSQL 8.1.2



i want to enable autovacuum at my PostgreSQL 8.1.2  from postgresql.conf
i've got 50-60 insert and/or update queries in a second in that case tables 
shouldn't be locked
does autovacuum locks tables while vacuuming?

and also i wonder what should be the configuration?

memory: 2gb ddr2
CPU: P4-prescott 3193.495 MHz
cache size      : 2048 KB



Alp UYANIK
Software Engineer