How do I drop a materialized view?

How do I drop a materialized view?

Use the DROP MATERIALIZED VIEW statement to remove an existing materialized view from the database. When you drop a materialized view, Oracle Database does not place it in the recycle bin. Therefore, you cannot subsequently either purge or undrop the materialized view.

How do I delete a materialized view in Oracle?

For you to delete rows from a table, the table must be in your own schema or you must have the DELETE object privilege on the table. For you to delete rows from an updatable materialized view, the materialized view must be in your own schema or you must have the DELETE object privilege on the materialized view.

How manually refresh materialized view in Oracle 10g?

1. Set the initialization parameters and bounce the database.
2. Create the materialized view table.
3. Create the optimizer statistics and refresh the materialized view.
4. Test the materialized view.
5. Create the MVIEW log(s) MATERIALIZED VIEW.
6. Execute a manual complete refresh.

How do I create a or replace materialized view?

1. Create a new table called mview_1 on prebuilt table.
2. Once it has been created you can drop the old one.
3. create or replace view mview as select * from mview_1.

Why do we need to refresh materialized views in Oracle?

If any of the materialized views are defined as ON DEMAND refresh (irrespective of whether the refresh method is FAST, FORCE, or COMPLETE), you must refresh them in the correct order (taking into account the dependencies between the materialized views) because the nested materialized view are refreshed with respect to the current contents of the other materialized views (whether fresh or not).

When to use a materialized view?

Materialized views are primarily used to increase application performance when it isn’t feasible or desirable to use a standard view with indexes applied to it. Materialized views can be updated on a regular basis either through triggers or by using the ON COMMIT REFRESH option.

Is materialized view refreshed automatically?

A materialized view can be refreshed automatically using the ON COMMIT method. 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.

Can I rename a materialized view?

Such materialized views can be queried but can’t be refreshed. In this case, you must drop and recreate the materialized view. In general, you can’t alter a materialized view’s definition (its SQL statement). You can’t rename a materialized view.