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. Materialized views are created using a create materialized view statement, which is similar to a create table statement. 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. We can now create the materialized view. Creates a materialized view (also called a snapshot), which is the result of a query run against one or more tables or views. 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. 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: Notice the ENABLE ON QUERY COMPUTATION option, which is new to Oracle 12.2. One issue with highly-normalized, non-redundant Oracle table designs (e.g. 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> create materialized view mv 2 build immediate 3 refresh fast on demand as 4 select * from t; Materialized view created. 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. You can create materialized views on external database products like DB2 and SQL Server (MSSQL) using Goldengate and Oracle heterogeneous services. 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. ALTER MATERIALIZED VIEW [schema. 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. Now you might say: “But the RESOURCE role contains the CREATE TABLE privilege, why do I have to grant that privilege explicitly?”. 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. Materialized views are an Oracle Silver Bullet when pre-joining tables together for super-fast response time. The FROM clause of the query can name tables, views, and other materialized views. ]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 … CREATE MATERIALIZED VIEW Purpose. Note. 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). 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. SQL> create materialized view log on t with PRIMARY KEY, rowid; Materialized view log created. SQL> insert into t values(55); 1 row created. 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