CREATE MATERIALIZED VIEW hr.departments <b>FOR UPDATE</b> AS
  SELECT * FROM hr.departments@orc1.world;

The following statement creates a materialized view group:

BEGIN
   DBMS_REPCAT.CREATE_MVIEW_REPGROUP (
      gname => 'hr_repg',
      master => 'orc1.world',
      propagation_mode => 'ASYNCHRONOUS');
END;
/

The following statement adds the hr.departments
materialized view to the materialized view group,
making the materialized view updatable:

BEGIN
   DBMS_REPCAT.CREATE_MVIEW_REPOBJECT (
      gname => 'hr_repg',
      sname => 'hr',
      oname => 'departments',
      type => 'SNAPSHOT',
      min_communication => TRUE);
END;
/