Check PrivilegesĬheck the user who will own the materialized views has the correct privileges. The ON PREBUILT TABLE clause tells the database to use an existing table segment, which must have the same name as the materialized view and support the same column structure as the query. An example of the query rewrite functionality is shown below. The QUERY REWRITE clause tells the optimizer if the materialized view should be consider for query rewrite operations.
ON DEMAND : The refresh is initiated by a manual request or a scheduled task.ON COMMIT : The refresh is triggered by a committed data change in one of the dependent tables.If one is not possible a complete refresh is performed.Ī refresh can be triggered in one of two ways. COMPLETE : The table segment supporting the materialized view is truncated and repopulated completely using the associated query.
If materialized view logs are not present against the source tables in advance, the creation fails. The following refresh types are available.
Home » Articles » Misc » Here Materialized Views in OracleĪ materialized view, or snapshot as they were previously known, is a table segment whose contents are periodically refreshed based on a query, either against a local or remote table.