alter materialized view refresh on demand

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. It can be defined to be refreshed ON COMMIT or ON DEMAND. 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. The time taken to complete the commit may be slightly longer than usual when this method is chosen. The refresh mode and refresh type of the created mview is refresh fast on demand. Refreshing a Materialized View. The attributes related to refreshing a materialized view are specified at the creation time of the materialized view (or later through the ALTER MATERIALIZED VIEW statement). materialized view problem while refreshing Hi We have have an ORACLE 8.1.7 database on suse linux 7.2 and we have a materialized view with joins and created a primary key constraint on the mview. Create the MV with the clause "REFRESH COMPLETE ON DEMAND" You don't define a refresh time when creating the MV. 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. In contrary of views, materialized views avoid executing the SQL query for every access by storing the result set of the query. In order to disable that you must break the dbms_job that was created in order to refresh the view. The materialized view can't use database links. Up to this point in the tutorial we have always refreshed our materialized views manually with the DBMS_MVIEW.REFRESH command. A REFRESH ON COMMIT materialized view will be refreshed automatically when a transaction that does DML to one of the materialized view's detail tables commits. 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 two most important attributes that impact the refresh time are: Refresh FAST or COMPLETE Refresh ON COMMIT or ON DEMAND This is know as ON DEMAND refreshing and it is the default refresh mode when none is specified in the CREATE MATERIALIZED VIEW command. The frequency of this refresh can be configured to run on-demand or at regular time intervals. Mview are local copies of data located remotely, or are used to … I will not show you the materialized view concepts, the Oracle Datawarehouse Guide is perfect for that. I don't think this is a problem as I see this as a solution for real-time reporting and dashboards, rather than part of a distributed environment. Eg, using DBMS_JOB to refresh the MV at midnight every day, you could create the job with declare A materialized view created with the automatic refresh can not be alter to stop refreshing. To refresh the MV at a particular time you would need to set up a background job to run at the specific time to do the refresh. The materialized view must be capable of a fast refresh, so all the typical fast refresh restrictions apply here also. @SejalParikh refresh groups are best for 1 thing: data consistency between related mviews. An implicit commit is performed before/after DBMS_MVIEW.REFRESH is called, so data inconsistency can come into play if you have multiple mviews with PK/FK relationships. SQL> create index mv_testtabobj_idx1 on mv_testtabobj (OWNER,TABLE_NAME); Index created. I have not enabled the query rewrite and by * 8 from emp a, dept b 9 where a.dept_id=b.dept_id; Materialized view created. In other words this create materialized view mv as select * from t ; None is specified in the create materialized view created with the clause `` refresh COMPLETE on DEMAND apply here.. The created mview is refresh fast on DEMAND refreshing and it is the refresh! Create materialized view created define a refresh time when creating the MV refresh the view will not show you materialized! Avoid executing the SQL query for every access by storing the result set of the.. Set of the query the automatic refresh can not be alter to stop refreshing can be configured to on-demand. 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