Oracle materialized view start with

How do you create an oracle view? When to use materialized view? Can we use create or replace materialized view? How to refresh of materialized view?

Because the materialized view conforms to the conditions for fast refresh, the database will perform a fast refresh.

Materialized Views in Oracle. Using materialized views against remote tables is the simplest way to achieve replication of data between sites. Creating materialized view that. Refreshing an existing materialized View. The FROM clause of the query can name tables, views , and other materialized views.

Collectively these source objects are called master tables (a replication term) or detail tables (a data warehousing term). A materialized view is a database object that contains the of a query. This reference uses the term master tables for consistency.

Each materialized view log is associated with a single base table. The materialized view log resides in the same database and schema as its base table. Oracle automatically registers a materialized view at its master site or master materialized view site when you create the materialized view , and unregisters the materialized view when you drop it. The same applies to materialized view groups. Without a materialized views log, Oracle Database must re-execute the materialized view query to refresh the materialized views.

This process is called a complete refresh. Usually, a fast refresh takes less time than a complete refresh. Oracle materialized views were first introduced in Oracle and in Oracle materialized views were enhanced to allow very fast dynamic creation of complex objects. If you omit the START WITH value, then Oracle Database determines the first automatic refresh time by evaluating the NEXT expression with respect to the creation time of the materialized view.

If you specify a START WITH value but omit the NEXT value, then Oracle Database refreshes the materialized view only once. Some materialized views have status invali however, they compile with no errors. Both the sources databases are in Oracle. My Oracle version is 11. We have got new business requirement.

Finding the Oracle job associated with a specific materialized view. Changing the refresh time for a particular materialized view. R12) where online patching or editioning is enabled.

Oracle Database can use this materialized view log to perform fast refreshes for all fast-refreshable 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 view. It is different from simple view. These materialized view have data stored and when you query the materialized view ,it returns data from the data stored. The database uses automatic query rewrite to redirect the query from the detailed fact table to the materialized view.

In order to encourage the database to rewrite queries to the materialized view ,. I am not sure if this will only refresh once a day at 6am. I guess I can wait to see for sure, but hopefully, I can get an answer here faster. What is going on is that, during the day, periodically, the materialized view , and the ones based on it, are set to an INVALID state, as can be seen by inspecting the user_objects view.