SQL> create table t(x number(2) primary key); Table created. 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: Under the covers, a materialized view is really just a table that gets automatically updated when the tables it is based on get updated. Note. CREATE MATERIALIZED VIEW Purpose. 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: âBut the RESOURCE role contains the CREATE TABLE privilege, why do I have to grant that privilege explicitly?â. The FROM clause of the query can name tables, views, and other materialized views. SQL> create materialized view mv 2 build immediate 3 refresh fast on demand as 4 select * from t; Materialized view created. SQL> insert into t values(55); 1 row created. SQL> create index mv_testtabobj_idx1 on mv_testtabobj (OWNER,TABLE_NAME); Index created. Materialized views are created using a create materialized view statement, which is similar to a create table statement. 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. This can be performed using SQL Developer, SQL*Plus, or OEM. We can now create the materialized view. ALTER MATERIALIZED VIEW [schema. 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. Question: How is the "using index" clause used when creating a materialized view? The key thing is that an ORDER BY in a materialized view makes no sense. But being a table means that no ordering can ever be guaranteed. 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. Notice the ENABLE ON QUERY COMPUTATION option, which is new to Oracle 12.2. Creates a materialized view (also called a snapshot), which is the result of a query run against one or more tables or views. One issue with highly-normalized, non-redundant Oracle table designs (e.g. Collectively these are called master tables (a replication term) or detail tables (a data warehouse term). 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. 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 the CREATE MATERIALIZED VIEW statement works as expected: simondba@KDB01:SQL> CREATE MATERIALIZED VIEW simon.simon_mv AS SELECT * FROM dual; Materialized view created. 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. 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. 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