Some commands handle the input/output of the catalogues to the database and these define a new group of utility procedures. To insert a catalogue in a Personal Data Base is not a heavy work, but requires attention. Two commands help the user in this task. When the input catalogue is written in FITS format the DB_FROMFT command inserts the catalogue in an automatic way. The DB_INSTAB can be used to insert tables of formatted data. Then the user can write FITS catalogues with the DB_TOFITS :.