oracle materialized view fast refresh

A materialized view log was created for the employee table, so Oracle Database performs a fast refresh of the materialized view every 7 days, beginning 7 days after the materialized view is created. REFRESH_FAST_AFTER_ANY_DML. A more elegant and efficient way to refresh materialized views is a Fast Refresh. To do so we have created Materialized Views using dblinks to get data from these two other db sources. If this capability is possible, fast refresh from a materialized view log is possible regardless of the type of update operation or the number of tables updated. // *Action: Use REFRESH COMPLETE. With this refresh method, only the changes since the last refresh are applied to the materialized view. Materialized View Fast Refreshes are Slow. The REFRESH FAST clause of the CREATE MATERIALIZED VIEW command tells Oracle what type of refresh to perform when no refresh option is specified. A materialized view created with REFRESH FAST can still be refreshed completely if required though. The name “Fast Refresh” is a bit misleading, because there may be situations where a Fast Refresh is slower than a Complete Refresh. // materialized view, and no materialized view supports // fast refersh after container table PMOPs. A complete refresh on the other hand rebuilds the materialized view from scratch. DBMS_SNAPSHOT.REFRESH( 'v_materialized_foo_tbl','f'); first parameter is name of mat_view and second defines type of refresh. Oracle Materialized View Fast refresh on remote database GM Tom,In my current db implementation, we do not have any data/tables in our db and gets all data from two other data sources. Oracle Database Backup Service - Version N/A and later Information in this document applies to any platform. REFRESH_FAST_AFTER_ANY_DML. We use to COMPLETE refresh our Materialized Views daily at off bu f denotes fast refresh. If this capability is not possible, fast refresh from a materialized view log may not be possible when the update operations are performed on multiple tables. Fast Refresh. With the fast refresh Oracle keeps track of the changes for the base tables and applies the changes to the materialized view when it is refreshed. Jain, July 2015 (varun.jain@varunjaininc.com) Varun Jain, Inc. (an Oracle Partner) A materialized view that is verified to be fast refresh should update relatively fast. PCT refresh is also not enabled on the materialized view Action: Use just REFRESH, which will reinstantiate the entire table. truncating would prevent a fast refresh. When you create a materialized view log for a master table or master materialized view, Oracle creates an underlying table as the materialized view log. A materialized view log is required on a master if you want to perform a fast refresh on materialized views based on the master. Because the materialized view conforms to the conditions for fast refresh, the database will perform a fast refresh. By V.J. If you try to create a fast-refreshable materialized view or run a fast refresh on a materialized view that violates the documented restrictions, you may receive an ORA-12052. but keep this thing in mind it will override any any other refresh timing options. Purpose. Note: you can determine why your // materialized view does not support fast refresh after PMOPs using // the DBMS_MVIEW.EXPLAIN_MVIEW() API. If this capability is possible, fast refresh from a materialized view log is possible regardless of the type of update operation or the number of tables updated. If this capability is not possible, fast refresh from a materialized view log may not be possible when the update operations are performed on multiple tables. Defines type of refresh to perform when no refresh option is specified more... 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