Oracle materialized view refresh on demand

The following sequence would enable Oracle to parallelize the refresh of the materialized view. Bulk load into the detail table. Enable parallel DML with an ALTER SESSION ENABLE PARALLEL DML statement. Refresh the materialized view. This is know as ON DEMAND refreshing and it is the default refresh mode when none is specified in the CREATE MATERIALIZED VIEW command.

Nevertheless, the NEXT definition should cause Oracle to submit a scheduled job. Materialized views refresh mode and refresh. For on demand refreshes , you can choose to manually refresh the materialized view or refresh it as part of a refresh group. The following code creates a refresh group defined to refresh every minute and assigns a materialized view to it. In Oracle , if you specify REFRESH FAST for a single-table aggregate Oracle materialized view , you must have created a materialized view log for the underlying table, or the refresh command will fail.

When creating an Oracle materialized view , you have the option of specifying whether the refresh occurs manually (ON DEMAND ) or automatically (ON COMMIT, DBMS_JOB). You have to go for complete refreshes with union. But you can fast refresh with union all. By default, Oracle Database creates a primary key materialized view with refresh on demand only. If a materialized view log exists on employees, then mvcan be altered to be capable of fast refresh.

If no such log exists, then only full refresh of mvis possible. It can be defined to be refreshed ON COMMIT or ON DEMAND. The time taken to complete the commit may be slightly longer than usual when this method is chosen. A solution has been proposed to use materialized views with REFRESH ON DEMAND. Create materialized views of all the views in question.

At the end of each batch process, refresh the materialized views , run the reports. However, what would be the impact of say: Location finishes its batch. A COMPLETE refresh indicates that the materialized view will be refreshed by re-executing the query defining the materialized view. The ON COMMIT refresh indicates that the materialized view will be whenever the data in the master table changes.

The ON DEMAND refresh indicates that the materialized view will be refreshed on demand by explicitly executing one of the REFRESH procedures in the DBMS_MVIEW package. Starts the report process. If you change the evaluation edition of a refresh - on - demand materialized view , then Oracle Database sets the staleness state of the materialized view to STALE unless you specify CONSIDER FRESH. A materialized view has been created as follows in Oracle 10g.

When I update or insert or delete or truncate data from EMP table, materialized view EMP_V_MV is not refresh. You can set any interval although. REFRESH , the MV gets truncated and reloads data,that process takes 1-minutes.

For local materialized views , it chooses the refresh method which is estimated by optimizer to be most efficient. Iam trying to refresh the materialized view by using: DBMS_MVIEW. Then I have created a stored procedure like this: CR.