vacuum deadlock

Hi,

I am using PostgreSQL 8.3.7.
autovacuum is enabled in postgresql.conf

I got a deadlock while vacuuming all databases with vacuumdb command.

vacuumdb: vacuuming of database "mydb" failed: ERROR: deadlock detected
DETAIL: Process 1294 waits for AccessExclusiveLock on relation 2662 of
database ; blocked by process 1807.
Process 1807 waits for AccessShareLock on relation 1259 of database 16389;
blocked by process 1294.

I think, because of this lock, deleting a large table (15 million records)
was taking too much time
How can I know the name of the relations 2662 and 1259?

Do you have any ide about the problem and solution?

Thanks in advance.