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ALTER MATERIALIZED VIEW
Change the properties of an existing mview. - the word "snapshot" 
  is synonymous with "materialized view". 
  
  Syntax:
   ALTER MATERIALIZED VIEW [schema.]materialized_view options
      [USING INDEX index_options]
         [REFRESH [refresh_options]]
            [COMPILE | CONSIDER FRESH | {ENABLE|DISABLE} QUERY REWRITE]
options:
   LOGGING | NOLOGGING
   CACHE | NOCACHE
   PARALLEL int | NOPARALLEL
   ALLOCATE EXTENT [( [DATAFILE filename] [SIZE int {K | M}] [INSTANCE int] )]
   Partitioning clause << Note:cannot modify LOB Storage here>>
   PCTFREE int
   PCTUSED int
   INITRANS int
   MAXTRANS int
   STORAGE storage_clause
index_options
   INITRANS int
   MAXTRANS int
   STORAGE storage_clause
refresh_options:
   FAST | COMPLETE | FORCE
   ON [DEMAND | COMMIT]
   {NEXT | START WITH} date
   WITH PRIMARY KEY
   USING DEFAULT MASTER ROLLBACK SEGMENT
   USING MASTER ROLLBACK SEGMENT rb_segment
Related Commands:
GRANT ALTER ANY MATERIALIZED VIEW
  MVIEW - CREATE MATERIALIZED VIEW
  MVIEW - DROP MATERIALIZED VIEW
  MVIEW LOG - ALTER MATERIALIZED VIEW LOG  
   
  DBMS_MVIEW
  DBMS_REFRESH 
  
  Related Views:
DBA_MVIEWS ALL_MVIEWS USER_MVIEWS DBA_MVIEW_AGGREGATES ALL_MVIEW_AGGREGATES USER_MVIEW_AGGREGATES DBA_MVIEW_ANALYSIS ALL_MVIEW_ANALYSIS USER_MVIEW_ANALYSIS DBA_MVIEW_DETAIL_RELATIONS ALL_MVIEW_DETAIL_RELATIONS USER_MVIEW_DETAIL_RELATIONS DBA_MVIEW_JOINS ALL_MVIEW_JOINS USER_MVIEW_JOINS DBA_MVIEW_KEYS ALL_MVIEW_KEYS USER_MVIEW_KEYS DBA_SNAPSHOTS ALL_SNAPSHOTS USER_SNAPSHOTS DBA_SNAPSHOT_LOGS ALL_SNAPSHOT_LOGS USER_SNAPSHOT_LOGS DBA_SNAPSHOT_LOG_FILTER_COLS DBA_SNAPSHOT_REFRESH_TIMES ALL_SNAPSHOT_REFRESH_TIMES USER_SNAPSHOT_REFRESH_TIMES