Overview

DWS materialized views support nested creation, refreshing, and rewriting. Using nested materialized views can simplify the process of defining a single view.

• Creating a nested materialized view: You can build a materialized view based on the materialized view.
• Cascading refresh: When refreshing a nested materialized view, not only the current view is refreshed, but automatic cascading refresh is also supported.
• Scheduled cascading refresh:You can specify and modify the refresh mode for periodically refreshed materialized views.
• Rewriting nested materialized views: Query statements can be automatically rewritten as SQL statements for querying materialized views.