WARNING some databases have not been vacuumed

I just got this email from root, what can I do about this?

Reloading httpd: [  OK  ]
/etc/cron.daily/vacuumdb:

WARNING:  some databases have not been vacuumed in over 2 billion transactions
DETAIL:  You may have already suffered transaction-wraparound data loss.
SabrinAsked:
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Daniel WilsonCommented:
PostgreSQL?  What version?

http://www.postgresql.org/docs/8.1/static/maintenance.html

Is the vacuumdb routine running daily?  (As I read your message it appears to be, but I'm trying to confirm.)

Are some DB's busy enough that they are getting more than 2 billion transactions in a day?  Can you schedule the maintenance routine more frequently, say every 3 hours?

Hopefully this will get you started ... and somebody who know PostgreSQL & Linux better than I can help more!
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