What privilege is required for materialized view?
To create a materialized view in another user’s schema: You must have the CREATE ANY MATERIALIZED VIEW system privilege. The owner of the materialized view must have the CREATE TABLE system privilege.
What is the difference between materialized view and view materialized view?
Differences between Views and Materialized Views:
|Query expression are stored in the databases system, and not the resulting tuples of the query expression.||Resulting tuples of the query expression are stored in the databases system.|
Does materialized view occupy space?
A materialized view occupies space. It exists in the same way as a table: it sits on a disk and could be indexed or partitioned.
How do I make a materialized view read only?
- create materialized view mv_name. tablespace mv_data. as select * from base_table; By default materialized view refresh type is complete. This mv should be refreshed manually and using complete mode of refresh.
- create materialized view mv1. tablespace mv_data. build immediate. refresh fast.
- create materialized view mv1.
How do materialized views get refreshed?
The simplest form to refresh a materialized view is a Complete Refresh. It loads the contents of a materialized view from scratch. This means, if the SQL query of the materialized view has an execution time of two hours, the Complete Refresh takes at least two hours as well – or ofter even longer.
What is the advantage of materialized view in Oracle?
One of the biggest benefit of using a materialized view is that Oracle takes care of keeping the data in sync. If you have a separate aggregate table, you are responsible for keeping the data synchronized.
What is RFS in Oracle Data Guard?
Remote file server (RFS) The remote file server (RFS) process receives redo data from the primary database either in the form of archived redo logs or standby redo logs.
How does Oracle Data Guard work?
Oracle Data Guard provides a comprehensive set of services that create, maintain, manage, and monitor one or more standby databases to enable production Oracle databases to survive disasters and data corruptions. Oracle Data Guard maintains these standby databases as copies of the production database.
Are materialized views read only?
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 we do DML operations on materialized view?
Users can perform DML operations on a writeable materialized view, but if you refresh the materialized view, then these changes are not pushed back to the master and the changes are lost in the materialized view itself.