Vacuum Problem

Hello all,

I have a problem. The following message keeps appearing in logs :

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WARNING:  database "data_base" must be vacuumed within 2606182 transactions
HINT:  To avoid a database shutdown, execute a full-database VACUUM in
"data_base".

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Last week I have run : 'vacuumdb -vz -U postgres -ddata_base'
Today it's still listed in 'ps aux'

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postgres  2113  1.0  1.9  26256 20132 ?        D    Nov26 130:14
postgres: postgres data_base [local] VACUUM
root       2146  0.0  0.1   4616  1508 tty1     Ss   Nov28   0:00 -bash
root      2176  0.0  0.0   4648   996 tty1     S+   Nov28   0:00
vacuumdb -vz -U postgres -ddata_base
postgres  2177  0.0  0.3  10260  3572 ?        S    Nov28   7:12
postgres: postgres data_base [local] VACUUM waiting

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In pg_stat_activity I can see two lines mentionning 'vacuum verbose analyze'

What can I do ??
I really need help

Cedric