what is materialized view in oracle

CREATE MATERIALIZED VIEW . A materialized view in Oracle is a database object that contains the results of a query. A materialized view can combine all of that into a single result set that’s stored like a table. A materialized view is a database object that contains the results of a query. It stores data physically and get updated periodically. Updatable materialized views were part of a feature called Advanced Replication. Usually, a fast refresh takes less time than a complete refresh.A materialized views log is located in the master database in the same schema as the master table. You can reference a materialized view in your code much like a real table. SQL> create index mv_testtabobj_idx1 on mv_testtabobj (OWNER,TABLE_NAME); Index created. While querying Materialized View, it gives data directly from Materialized View and not from table. A complete refresh occurs when the Oracle materialized view is initially defined, unless it references a prebuilt table, and a complete refresh may be requested at any time during the life of the Oracle materialized view. In Oracle 8i, snapshots were renamed to materialized views, and updatable snapshots became updatable materialized views. This process is called a complete refresh. The FROM clause of the query can name tables, views, and other materialized views. and hence, they need a refresh mechanism. Without a materialized views log, Oracle Database must re-execute the materialized view query to refresh the materialized views. This means that any user or application that needs to get this data can just query the materialized view itself, as though all of the data is in the one table, rather than running the expensive query that uses joins, functions, or subqueries. Materialized views which store data based on remote tables were also known as snapshots, (deprecated Oracle terminology). The above allowed users to perform DML operations on snapshots/materialized views, and those changes could be replicated back to the master tables. Materialized views also differ from views because they are "redundant", being copied from the base tables. SQL> create materialized view mv_testtabobj refresh on demand as select a.table_name, a.owner, b.object_id, b.object_type from test_tab a, test_obj b where a.table_name=b.object_name; Materialized view created. In Oracle pl SQL, a Materialized view is a copy of a target master, at one point in time. Because the materialized view conforms to the conditions for fast … Materialized View: Unlike a view, a materialized view has a concrete existance, in the sence that the tables are pre-joined and aggreations made and the results of the query are stored on disk. The Overflow Blog Podcast 297: All … A materialized view is a view where the query has been executed and the results has been stored as a physical table. The following is an example of an Oracle materialized view on prebuilt table with an ON COMMIT refresh: In fact, it is a real table that you can index, declare constraints etc. Materialized Views in Oracle; Introduction. A materialized view log was created for the employee table, so Oracle Database performs a fast refresh of the materialized view every 7 days, beginning 7 days after the materialized view is created. When accessing a materialized view, you are accessing the pre-computed results. Purpose. Use the CREATE MATERIALIZED VIEW statement to create a materialized view. Browse other questions tagged oracle oracle-sqldeveloper data-warehouse materialized-views or ask your own question. In any database management system following the relational model , a view is a virtual table representing the result of a database query . 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