MODIFY DEFAULT ATTRIBUTES [FOR PARTITION partition] [segment_attributes_clause] 
[PCTTHRESHOLD integer][ COMPRESS | NOCOMPRESS ] [overflow_attributes] 
[{ LOB ( LOB_item ) | VARRAY varray } ( LOB_parameters ) 
 [{ LOB ( LOB_item ) | VARRAY varray } ( LOB_parameters )]...
]

For information on the symbols and conventions of Backus-Naur Form (BNF) syntax, see Appendix A.