Why Does Materialized View Become Invalid?
When an Mv Is Created, the Materialized View Depends on the Master Tables Referenced in Its Definition. Any Dml Operation, Such as an Insert, or Delete...
When an MV is created, the materialized view depends on the master tables referenced in its definition. Any DML operation, such as an INSERT, or DELETE, UPDATE, or DDL operation on any dependency in the materialized view will cause it to become invalid.
Do we need to refresh materialized view?
Unlike indexes, materialized views are not automatically updated with every data change. They must explicitly be refreshed, either on every commit, on a periodically time schedule or – typically in data warehouses – at the end of an ETL job.
Can a materialized view be updated?
Materialized views are disc-stored views that can be refreshed. ... You can't insert data into a materialized view as you can with a table. To update the contents of a materialized view, you can execute a query to refresh it. This will re-execute the query used to create it.
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