A 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. REFRESH MATERIALIZED VIEW completely replaces the contents of a materialized view. Description. If WITH DATA is specified (or defaults) the backing query is executed to provide the new data, and the materialized view is left in a scannable state. Why do you need a refresh group? Materialized Views: Refresh Statistics History - How can I see data in user_mvref_stmt_stats Hi Masters,sorry for another question :-) and again a big, big thank You for Your hard work and the answers to our questions! it works but materialized view does not refresh … The simplest form to refresh a materialized view is a Complete Refresh. The information returned by the view includes the view name and credits consumed each time a materialized view … ON COMMIT Refresh. In contrary of views, materialized views avoid executing the SQL query for every access by storing the result set of the query. For all times: 1. Therefore, whenever a transaction commits which has updated the tables on which a materialized view is defined, those changes are automatically reflected in the materialized view. Re: check materialized view refresh history 592815 Jun 24, 2009 8:51 PM ( in response to Boochi ) Hi Boochi, Thanks for your help. When a master table is modified, the related materialized view becomes stale and a refresh is necessary to have the materialized view up to date. A materialized view log (snapshot log) is a schema object that records changes to a master table's data so that a materialized view defined on that master table can be refreshed incrementally. The following queries can be used to determine when materialized views were last refreshed. I will not show you the materialized view concepts, the Oracle Datawarehouse Guide is perfect for that. The materialized view knows what to do, as it has the query that is used to populate the data stored with it. Materialized Views in Oracle. The old contents are discarded. Some of the statement fail, because I do not have all the privs in liveSQL. !Could You please have a look into my test case? A materialized view can be refreshed automatically using the ON COMMIT method. But Materialized view is a database object that stores the results of a query and it can be from local database or from remote database and use data segment to store the data. Refresh Group: A refresh group is a collection of Materialized Views. It loads the contents of a materialized view from scratch. The frequency of this refresh can be configured to run on-demand or at regular time intervals. To execute this command you must be the owner of the materialized view. (Back to Top) Views are only a stored query and run the query each time the view is accessed. This means, if the SQL query of the materialized view has an execution time of two hours, the Complete Refresh takes at least two hours as well – … Using materialized views against remote tables is … What’s the Difference Between a View and a Materialized View? With a materialized view, you just run a command to refresh it. If the materialized view refresh is taking time, we can enable trace and find out the explain plan for the execution using below useful articles. This can be achieved using a refresh group. This Account Usage view can be used to query the materialized views refresh history. We see real time data in a VIEW. Filed Under: Oracle, Oracle Database Tagged With: How to monitor the progress of refresh of Materialized views. This object gets refreshed on a periodical basis either through a DBMS refresh job or via command line. How To Find Last Refresh Time of Materialized Views. 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