vacuuming

Is it common practice to setup a cron job to vacuum your databases
nightly?  Do you just do something like:

psql my_db < vacuum

in cron?  I was reading about administration and it talked about how
vacuuming is such a good idea and all.

If i am going to cron vacuum, is there anything else I should be doing, or
is just "psql my_db < vacuum" all that needs done on a nightly basis.

Brian


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