[GRASS-user] No table after 'v.dissolve'

I'm trying to dissolve (on an integer column) a vector map. It works well
but no table is created.

The db.connect -p reports :
driver:dbf
database : ....... /dbf/
schema : (null)
group : (null)

and the dbf/ subdirectory already exists in the mapset

What's the problem ?
Thank you,