A materialized view is a view whose result set is stored on disk, much like a base table, but that is computed, much like a view. Conceptually, a materialized view is both a view (it has a query specification) and a table (it has persistent materialized rows). So, many operations that you perform on tables can be performed on materialized views as well. For example, you can build indexes on, and unload from, materialized views.
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