ENABLE Clause
Enable constraints (or triggers) 
  
  Syntax:
   ENABLE [[NO]VALIDATE] [UNIQUE] (column [,...] ) options [CASCADE] [{DROP|KEEP} INDEX]
   ENABLE [[NO]VALIDATE] PRIMARY KEY options [CASCADE]  [{DROP|KEEP} INDEX]
   ENABLE [[NO]VALIDATE] CONSTRAINT constraint_name options [CASCADE]  [{DROP|KEEP} INDEX]
   ENABLE ALL TRIGGERS
Options:
   
    USING INDEX storage_options
    USING INDEX (create_index_statement)
    SORT | NOSORT
    LOCAL | GLOBAL PARTITION BY RANGE (column_list)
               (PARTITION partition
                   VALUES LESS THAN (value [,value...]) storage_options
    EXCEPTIONS INTO [schema.]table
storage_options:
       PCTFREE int
       PCTUSED int
       INITTRANS int
       MAXTRANS int
       STORAGE storage_clause
       TABLESPACE tablespace
       LOGGING|NOLOGGING
notes:
  If more than one option is specified - you only need the first "USING INDEX" 
  
  
  If EXCEPTIONS INTO is specified it should be the last option listed.
  
   Related Commands:
constraint - clause
  disable - Disable a constraint 
  drop - clause 
ALTER TABLE
Related Views:
 DBA_CONSTRAINTS    ALL_CONSTRAINTS    USER_CONSTRAINTS 
 
DBA_CONS_COLUMNS   ALL_CONS_COLUMNS   USER_CONS_COLUMNS