WARNING: database must be vacuumed within 8439472 transactions

[Prabhjot Sheena <prabhjot.sheena@xxxxxxxxxxxxxx>]

Hello

       We are using postgresql 8.3 database for last 5 yrs for this production database and its running fine. This is our critical database which runs 24*7. This weekend we started getting these messages

HINT:  To avoid a database shutdown, execute a full-database VACUUM.
WARNING:  database  must be vacuumed within 8439472 transactions

i am currently running this command

vacuumdb --analyze db

while this command is running i m still getting these messages

WARNING:  database  must be vacuumed within 2645303 transactions.

The value of number of transactions is going down every minute

Can anyone tell me what is the best way to sort up this issue.

Thanks

Avi