What is materialized view in Oracle 11g with example?

What is materialized view in Oracle 11g with example?

A materialized view is a database object that contains the results of a query. The FROM clause of the query can name tables, views, and other materialized views. You can select data from a materialized view as you would from a table or view.

How do I 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 .

What is build immediate materialized views in Oracle?

Build Immediate: Means materialized views(mv) created immediately. 2. Build Deferred: Means materialized views(mv) created after one refresh. 3.Refresh on commit: This option committed the data in materialized views in SQL immediately after data inserted and committed in table.

What is materialized view in Snowflake?

A materialized view is a pre-computed data set derived from a query specification (the SELECT in the view definition) and stored for later use. Because the data is pre-computed, querying a materialized view is faster than executing a query against the base table of the view.

What is a snowflake materialized view?

What happens when you create a materialized view in Oracle?

When you create a materialized view, Oracle Database creates one internal table and at least one index, and may create one view, all in the schema of the materialized view. Oracle Database uses these objects to maintain the materialized view data. You must have the privileges necessary to create these objects.

Do you have to have create any materialized view privilege?

You must have the CREATE ANY MATERIALIZED VIEW system privilege. The owner of the materialized view must have the CREATE TABLE system privilege.

How to create Materialized View with query rewrite enabled?

To create the materialized view with query rewrite enabled, in addition to the preceding privileges: If the schema owner does not own the master tables, then the schema owner must have the GLOBAL QUERY REWRITE privilege or the QUERY REWRITE object privilege on each table outside the schema.

How to keep materialized view synchronized with master table?

If you want to keep the contents of the materialized view synchronized with those of the master table, Oracle recommends that you manually perform a complete refresh of all materialized views dependent on the table after dropping or truncating a table partition.