Oracle create materialized view existing table

Use these property clauses to describe a materialized view that is not based on an existing table. To create a materialized view that is based on an existing table , use the ON PREBUILT TABLE clause. The column_properties clause lets you specify the storage characteristics of a LOB, nested table , varray, or XMLType column. In this case, you can convert an existing table to a materialized view by using the ON PREBUILT TABLE clause. Materialized Views in Oracle.

Using materialized views against remote tables is the simplest way to achieve replication of data between sites. To fast refresh a materialized join view , you must create a materialized view log for each of the tables referenced by the materialized views. So having the table and materialized view with the same name is normal. Oracle - How to create a materialized view. To create a nested materialized view on the table join_sales_cust_time, you would have to create a materialized view log on the table.

Because this will be a single-table aggregate materialized view on join_sales_cust_time, you must log all the necessary columns and use the INCLUDING NEW VALUES clause. CREATE ANY MATERIALIZED VIEW. Cause: The table or view entered does not exist, a synonym that is not allowed here was use or a view was referenced where a table is required. Create materialized view on the new db on the prebuild table and keep refresh it from the point when the mv log was created. The problem is that the moment the materialized view is created the mv log on the old table is purged.

Prerequisites The privileges required to create a materialized view log directly relate to the privileges necessary to create the underlying objects associated with a materialized view log. ROWID as P_ROWID FROM TPM_PROJECTVERSION V, TPM_PROJECT P WHERE P. PROJECTID Another key aspect to note is that your materialized view logs must be created as with rowid. So, for example, if you have a bunch of existing reports against a detail table that produce daily, monthly, and yearly aggregate , you can create a materialized view on the base table that aggregates the data at a daily level and the optimizer can utilize that materialized view for all your existing queries. Is there any reason why it would be necessary for the master table of a materialized view to have a primary key in order that fast refresh work? These tables are used to create a REFRESH-ON-COMMIT materialized view constructed on top of an existing partitioned table.

If you drop a materialized view that was created on a prebuilt table , then the database drops the materialized view , and the prebuilt table reverts to its identity as a table. So, the table exists and you may again build a materialized view on it. Create the materialized view table. A materialized view can query tables , views , and other materialized views.

Here, we specify that the materialized view will be refreshed every two hours with the refresh fast option. Nevertheless, the net result is the same. Any query against the object actually looks at the data in the table. Once the base table is create the materialized view is defined on the existing table. The script to create the materialized view is shown in Figure 3. No it didnt had a related materialized view log table.

You cannot create both a materialized view and a prebuilt materialized view on the same table. For example, If you have a table costs with a materialized view cost_mv based on it, you cannot then create a prebuilt materialized view on table costs. The result would make cost_mv a nested materialized view and this method of conversion is not supported.