Warning: database postgres must be vacuumed within 1000000 transactions

I got a big problem:
Warning: database 'postgres' must be vacuumed within 1000000 transactions
HINT: To avoid database shutdown, execute a full database vacuum  in
'postgres'

Warning: database 'postgres' must be vacuumed within 999999 transactions
HINT: To avoid database shutdown, execute a full database vacuum  in
'postgres'

Warning: database 'postgres' must be vacuumed within 999998 transactions
HINT: To avoid database shutdown, execute a full database vacuum  in
'postgres'

Warning: database 'postgres' must be vacuumed within 999997 transactions
HINT: To avoid database shutdown, execute a full database vacuum  in
'postgres'

backend> vacuum


Warning: database 'postgres' must be vacuumed within 999996 transactions
HINT: To avoid database shutdown, execute a full database vacuum  in
'postgres'

Warning: database 'postgres' must be vacuumed within 999995 transactions
HINT: To avoid database shutdown, execute a full database vacuum  in
'postgres'

its so slow!, i dont know what else to do, it will take 20 days to do it
all, and i cant wait,
help me please!

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