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. ]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 … ALTER MATERIALIZED VIEW [schema. SQL> create table t(x number(2) primary key); Table created. 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. Question: How is the "using index" clause used when creating a materialized view? One issue with highly-normalized, non-redundant Oracle table designs (e.g. Materialized views are an Oracle Silver Bullet when pre-joining tables together for super-fast response time. Notice the ENABLE ON QUERY COMPUTATION option, which is new to Oracle 12.2. 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. Now you might say: “But the RESOURCE role contains the CREATE TABLE privilege, why do I have to grant that privilege explicitly?”. This can be performed using SQL Developer, SQL*Plus, or OEM. SQL> create materialized view log on t with PRIMARY KEY, rowid; Materialized view log created. The key thing is that an ORDER BY in a materialized view makes no sense. 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. SQL> create index mv_testtabobj_idx1 on mv_testtabobj (OWNER,TABLE_NAME); Index created. Under the covers, a materialized view is really just a table that gets automatically updated when the tables it is based on get updated. 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: 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. 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. Collectively these are called master tables (a replication term) or detail tables (a data warehouse term). Materialized views are created using a create materialized view statement, which is similar to a create table statement. But being a table means that no ordering can ever be guaranteed. 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. The FROM clause of the query can name tables, views, and other materialized views. Note. SQL> create materialized view mv 2 build immediate 3 refresh fast on demand as 4 select * from t; Materialized view created. 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. You can create materialized views on external database products like DB2 and SQL Server (MSSQL) using Goldengate and Oracle heterogeneous services. CREATE MATERIALIZED VIEW Purpose. 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. 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