MODIFY DEFAULT ATTRIBUTES
   [ FOR PARTITION partition ]
   [ segment_attributes_clause ]
   [ table_compression ]
   [ PCTTHRESHOLD integer ]
   [ key_compression ]
   [ alter_overflow_clause ]
   [ { LOB (LOB_item)
     | VARRAY varray
     }
     (LOB_parameters)
     [ { LOB (LOB_item)
       | VARRAY varray
       }
       (LOB_parameters)
     ]...
   ]