ORA-12052

Error: ORA-12052: cannot fast refresh materialized view string.string

Causa: Either ROWIDs of certain tables were missing in the definition or the inner table of an outer join did not have UNIQUE constraints on join columns.

Acción: Specify the FORCE or COMPLETE option. If this error occurred during creation, the materialized view definition may have been changed. Refer to the documentation on materialized views.