This can be performed using SQL Developer, SQL*Plus, or OEM. Collectively these are called master tables (a replication term) or detail tables (a data warehouse term). The FROM clause of the query can name tables, views, and other materialized views. We can now create the materialized view. ]materialized_view_name [Physical_Attributes_Clause] [STORAGE Storage_Clause] [REFRESH [FAST | COMPLETE | FORCE] [START WITH date] [NEXTREF date]Changes the storage or automatic refresh characteristics of a materialized view ⦠But being a table means that no ordering can ever be guaranteed. Oracle Database can use this materialized view log to perform fast refreshes for all fast-refresh-able materialized views based on the master table.To fast refresh a materialized join view, you must create a materialized view log for each of the tables referenced by the materialized views. Notice the ENABLE ON QUERY COMPUTATION option, which is new to Oracle 12.2. third normal form) is that Oracle experiences a high degree of overhead (especially CPU consumption) when joining dozens of tables together, over-and-over again, and partitioning may help. CREATE MATERIALIZED VIEW Purpose. Although CREATE MATERIALIZED VIEW does not support COUNT, DISTINCT, COUNT(DISTINCT expression), or COUNT_BIG (DISTINCT expression), SELECT queries with these functions can still benefit from materialized views for faster performance as the Synapse SQL optimizer can automatically re-write those aggregations in the user query to match existing materialized views. SQL> insert into t values(55); 1 row created. 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. Materialized views are created using a create materialized view statement, which is similar to a create table statement. Note. You can create materialized views on external database products like DB2 and SQL Server (MSSQL) using Goldengate and Oracle heterogeneous services. SQL> create table t(x number(2) primary key); Table created. Now you might say: âBut the RESOURCE role contains the CREATE TABLE privilege, why do I have to grant that privilege explicitly?â. One issue with highly-normalized, non-redundant Oracle table designs (e.g. Answer: When you specify a refresh fast of a materialized view, Oracle creates an index to assist in the fast refresh.The using index clause of the create materialized view command let's you specify the storage and initrans values for this index. SQL> create index mv_testtabobj_idx1 on mv_testtabobj (OWNER,TABLE_NAME); Index created. SQL> create materialized view log on t with PRIMARY KEY, rowid; Materialized view log created. Now the CREATE MATERIALIZED VIEW statement works as expected: simondba@KDB01:SQL> CREATE MATERIALIZED VIEW simon.simon_mv AS SELECT * FROM dual; Materialized view created. Use the CREATE MATERIALIZED VIEW statement to create a materialized view.A materialized view is a database object that contains the results of a query. The Oracle Replication:Expert Methods for Robust Data Sharing book has complete details and full step-by-step instructions for creating a materialized view over a database link. Materialized views are an Oracle Silver Bullet when pre-joining tables together for super-fast response time. Creates a materialized view (also called a snapshot), which is the result of a query run against one or more tables or views. ALTER MATERIALIZED VIEW [schema. The following listing shows a simple example of how to create the comm_prod_mv materialized view mentioned earlier, and Table 1 provides an explanation of the syntax: Question: How is the "using index" clause used when creating a materialized view? DROP MATERIALIZED VIEW LOG ON order_lines; CREATE MATERIALIZED VIEW LOG ON order_lines WITH ROWID, SEQUENCE(order_id, line_qty, total_value) INCLUDING NEW VALUES; Materialized View. In Oracle, if you specify REFRESH FAST for a single-table aggregate Oracle materialized view, you must have created a materialized view log for the underlying table, or the refresh command will fail. SQL> create materialized view mv 2 build immediate 3 refresh fast on demand as 4 select * from t; Materialized view created. The key thing is that an ORDER BY in a materialized view makes no sense. Under the covers, a materialized view is really just a table that gets automatically updated when the tables it is based on get updated. 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