Jerome Alet <alet(at)librelogiciel(dot)com> writes:
> if I drop a database and recreate a new one with the
> same name, the old datas and base schema are still there
> to annoy me.
Looks to me like you created some stuff in template1. See
http://www.ca.postgresql.org/users-lounge/docs/7.2/postgres/managing-databases.html#MANAGE-AG-TEMPLATEDBS
regards, tom lane