Just brief about feature: Starting 12.2 Oracle Database collects and stores statistics about materialized view refresh operations. SQL> create materialized view mv_testtabobj refresh on demand as select a.table_name, a.owner, b.object_id, b.object_type from test_tab a, test_obj b where a.table_name=b.object_name; Materialized view created. The view is scheduled to be refreshed once every 12 hours. This process is called a complete refresh. As we know why do we need materialized view in Oracle? A materialized view in Oracle is a database object that contains the results of a query. Materialized view log is a table associated with the master table of a materialized view. SQL> create index mv_testtabobj_idx1 on mv_testtabobj (OWNER,TABLE_NAME); Index created. Oracle supplies the DBMS_REFRESH package with the following procedures; MAKE: Make a Refresh Group: ADD: Add materialized view to the refresh group: SUBTRACT: Remove materialized view from the refresh group: REFRESH: Manually refresh the group: CHANGE: Change refresh interval of the refresh … Usually, a fast refresh takes less time than a complete refresh.A materialized views log is located in the master database in the same schema as the master table. They are local copies of data located remotely, or are used to create summary tables based on aggregations of a table's data. You can also scheduled it in Oracle Scheduler. I needed to find out how to allow a user to refresh another user’s materialized view. The view which we use to make a replica of a target master from a single point in a time is known materialized view. By refreshing the refresh group, you can ensure that the data in all of the materialized views in the refresh group correspond to the same transactionally consistent point in time. Symptoms SQL> create materialized view mv 2 --build deferred 3 refresh fast on demand 4 with primary key 5 enable query rewrite 6 as 7 select a.rowid erowid,b.rowid drowid ,b.dname, a. Materialized View Fast refresh containing UNION We would like to be able to use fast refresh on a materialised view which contains a union.This has worked when the union uses the same table. Once I had done this I decided to document it for future reference with a worked example, which I ran on an Oracle 11.2.0.2.7 database. Make a complete refresh: If the master table is quite small. If materialized view logs are not present against the source tables in advance, the creation fails. They are local copies of data located remotely, or are used to create summary tables based on aggregations of a table’s data. The problem is when we need to refresh our Materialized Views, a … Usually, a fast refresh takes less time than a complete refresh. A materialized view log is located in the master database in the same schema as the master table. Usually, a fast refresh takes less time than a complete refresh. there is delay of 5sec. CREATE MATERIALIZED VIEW "SYSTEM". Why do you need a refresh group? 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. This process is called a complete refresh. In order to refresh a materialized view owned by other user, you must have the following privileges in addition to privileges on objects owned by USER_A which are being used in the MV. This process is called a complete refresh. Example for manually refresh: exec dbms_mview.refresh(‘SALES_MV’,’C’); C – Complete refresh F – Fast refresh. 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