I've been reading this article, discussing the benefits, tradeoffs, and potential problems with Bitmapped Indexes. It is mentioned:
Also, remember that bitmap indexes are only suitable for static tables and materialized views which are updated at night and rebuilt after batch row loading. If your tables are not read-only during query time, DO NOT consider using bitmap indexes!
Most of our Materialized Views are updated nightly using the fast refresh method. Does the above quote mean that the MV should be rebuilt, or that the indexes should be rebuilt?