yangzhg commented on issue #7503:
URL: https://github.com/apache/doris/issues/7503#issuecomment-1160423392

   > > * MV is read only and updated only by system
   > 
   > Oh, I mean if I update/insert/delete the base table, the mv can be updated 
automatically? Is it an incremental update, or fully rebuild?
   
   > ```sql
   > 2. "refresh" refresh method
   >    (1) fast : 'Fast refresh'. Incremental refresh
   >    (2) complete: 'complete refresh'. Update all data when refreshing, 
including the original data that has been generated in the view
   >    (3) never : never refresh
   > ```
   
   Incremental updates and automatic hits may not be possible in the short term 
and can be used as future optimization goals
   


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