interMedia Text error

where it is the error?
I execute.

CREATE INDEX my_table_idx ON my_table (Nom) ;

OK

When I execute the query

SELECT * FROM my_table WHERE CONTAINS(my_table.pippo , 'pluto') >0;

it comes given back the error to me

ERRORE alla riga 1:
ORA-20000: interMedia Text error:
DRG-10599: la colonna non è indicizzata

Thanks
Sergio Received on Wed Jun 04 2003 - 07:55:34 CDT