i try to compare two methods of garbage-collect.(Postgresql Ver:8.1.3) 

1. enable autovacuum without using vacuumdb -f mydb in crontab. 
2. using crontab to vacuumdb in every 10 min (autovacuum disable) 


the method 2 got more free space than method 1. 


the disk size of database still  increased in method 1. 
so, what's the advantage of autovacuum? 



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