How do I automatically refresh a materialized view?

view group to do the refresh. You can also use m. view log to keep track of all the dml and the have it propagated to the m. view with a fast refresh on a remote database through the db link.

What is force refresh in materialized view?

COMPLETE : The table segment supporting the materialized view is truncated and repopulated completely using the associated query. FORCE : A fast refresh is attempted. If one is not possible a complete refresh is performed.

Can we update materialized view in Oracle 11g?

Specify ON DEMAND if you want the materialized view to be refreshed on demand by calling one of the three DBMS_MVIEW refresh procedures. If you omit both ON COMMIT and ON DEMAND , ON DEMAND is the default. Oracle Data Warehousing Guide on the types of materialized views you can create by specifying REFRESH ON DEMAND.

How do you quick refresh a materialized view?

For fast refresh to be possible, the SELECT list must contain all of the GROUP BY columns (if present), and there must be a COUNT(*) and a COUNT(column) on any aggregated columns. Also, materialized view logs must be present on all tables referenced in the query that defines the materialized view.

Can we insert data into materialized view?

Inserts one or more rows into a materialized table. Inserts the result of a SELECT clause into a materialized table. The benefit over the previous syntax is that with this one, you can insert several rows at once.

Can we use DML in materialized view?

A materialized view can be either read-only, updatable, or writeable. Users cannot perform data manipulation language (DML) statements on read-only materialized views, but they can perform DML on updatable and writeable materialized views.

Can you insert data into a view?

You can insert, update, and delete rows in a view, subject to the following limitations: If the view contains joins between multiple tables, you can only insert and update one table in the view, and you can’t delete rows. You can’t directly modify data in views based on union queries.

Why do we use materialized view in Oracle?

Materialized View Concepts Oracle uses materialized views (also known as snapshots in prior releases) to replicate data to non-master sites in a replication environment and to cache expensive queries in a data warehouse environment.

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.

What is Oracle material view?

A materialized view in Oracle is a database object that contains the results of a query. It stores data physically and get updated periodically.

How do I automatically refresh a materialized view? view group to do the refresh. You can also use m. view log to keep track of all the dml and the have it propagated to the m. view with a fast refresh on a remote database through the db link. What is force refresh in materialized…