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 an updatable materialized view in Oracle?

Steps to Setup Updatable Materialized View:

1. Setup Master Site.
2. Setup Materialized View Site.
3. Configure Master Refresh Group.
4. Configure Materialized view refresh Group.
5. Test the Replication of updatable materialized view.

What are all the restrictions in updatable materialized view?

An updatable materialized view based on a master table or master materialized view that has defined column default values does not automatically use the master’s default values. A DELETE CASCADE constraint used with an updatable materialized view must be deferrable.

What is the use of materialized view in Oracle?

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.

How we can refresh materialized view?

REFRESH MATERIALIZED VIEW completely replaces the contents of a materialized view. To execute this command you must be the owner of the materialized view. The old contents are discarded.

What is fast refresh in materialized view?

Fast refresh for a materialized view containing joins and aggregates is possible after any type of DML to the base tables (direct load or conventional INSERT , UPDATE , or DELETE ). It can be defined to be refreshed ON COMMIT or ON DEMAND .

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 result of the query has to have the same schema as the materialized table and in the result, the fields must be in the same order as in the target table. …

What does a fast refresh means in materialized view?

What are the restrictions for fast refresh materialized view with subqueries?

General Restrictions on Fast Refresh

• The materialized view must not contain references to non-repeating expressions like SYSDATE and ROWNUM.
• The materialized view must not contain references to RAW or LONG RAW data types.
• It cannot contain a SELECT list subquery.

Why do we use materialized view?

Materialized views are basically used to increase query performance since it contains results of a query. They should be used for reporting instead of a table for a faster execution.

How to update a materialized view directly in Oracle?

The updates and insert can be captured.. create materialized view on pre-built table. to capture inserts and updates. on the base table and then when mview is refreshed it wont be lost. The inserts could be done thru batch or dbms_Scheduler on base.

How does a updatable materialized view help the Master?

For changes made to an updatable materialized view to be pushed back to the master during refresh, the updatable materialized view must belong to a materialized view group. Updatable materialized views enable you to decrease the load on master sites because users can make changes to the data at the materialized view site.

Can a materialized view be read only or writeable?

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.

Which is the default type of materialized view?

Refresh-on-commit materialized views are those created using the ON COMMIT REFRESH clause in the CREATE MATERIALIZED VIEW statement. You can execute a distributed transaction on the master table of a refresh-on-demand materialized view. Primary key materialized views are the default type of materialized view.