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 do you drop a materialized view in Cassandra?
To drop a materialized view in a keyspace other than the current keyspace, put the keyspace name in front of the materialized view name, followed by a period.
How do you create a materialized view?
CREATE MATERIALIZED VIEW defines a materialized view of a query. The query is executed and used to populate the view at the time the command is issued (unless WITH NO DATA is used) and may be refreshed later using REFRESH MATERIALIZED VIEW .
Why materialized view is used?
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.
Can we rename a materialized view in Oracle?
Specifies the identifier of the materialized view to alter. This option allows you to rename a materialized view. The new identifier must be unique for the schema in which the view is created.
What are materialized views in Cassandra?
Materialized Views are essentially standard CQL tables that are maintained automatically by the Cassandra server – as opposed to needing to manually write to many denormalized tables containing the same data, like in previous releases of Cassandra.
How do I create a materialized view in Cassandra?
Optionally, add one non-PRIMARY KEY column from the base table to the materialized view’s PRIMARY KEY….
- Modify a user-defined type.
- CREATE KEYSPACE.
- CREATE MATERIALIZED VIEW. Create a materialized view.
- CREATE TABLE.
- Create a customized collection, user-defined type (UDT).
- Remove the named materialized view.
What happens if I drop a materialized view?
If you drop a materialized view, then any compiled requests that were rewritten to use the materialized view will be invalidated and recompiled automatically. If the materialized view was prebuilt on a table, then the table is not dropped, but it can no longer be maintained by the materialized view refresh mechanism.
Purpose. 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.
What is the difference between materialized view and snapshot?
The keyword SNAPSHOT is supported in place of MATERIALIZED VIEW for backward compatibility. The materialized view must be in your own schema or you must have the DROP ANY MATERIALIZED VIEW system privilege. You must also have the privileges to drop the internal table, views, and index that the database uses to maintain the materialized view data.
How to create a materialized view in a schema?
The materialized view must be in your own schema or you must have the DROP ANY MATERIALIZED VIEW system privilege. You must also have the privileges to drop the internal table, views, and index that the database uses to maintain the materialized view data. Specify the schema containing the materialized view.
