Alter materialized view oracle

ALTER MATERIALIZED VIEW. A materialized view is a database object that contains the of a query. The FROM clause of the query can name tables, views , and other materialized views. Use the alter _mv_refresh clause to change the default method and mode and the default times for automatic refreshes.

If the contents of the master tables of a materialized view are modifie then the data in the materialized view must be updated to make the materialized view accurately reflect the data currently in its master table(s). The following statement alters the materialized view log on hr. Any materialized aggregate views that use this log will no longer be fast refreshable. The CREATE MATERIALIZED VIEW syntax does not support that feature.

Unfortunately, a materialized view MV_T is defined on top of the table T, and to make things worse we have the MV_T materialized view primary key consists of the column ID. Creates a materialized view (also called a snapshot), which is the result of a query run against one or more tables or views. Can we use create or replace materialized view? When to use materialized view? What is the difference between views and materialized views?

In DBA_JOBS view you can find scheduled jobs. Using materialized views against remote tables is the simplest way to achieve replication of data between sites. Materialized Views in Oracle. If you specify a START WITH value but omit the NEXT value, then Oracle Database refreshes the materialized view only once.

If you omit both the START WITH and NEXT values, or if you omit the alter _mv_refresh entirely, then Oracle Database does not automatically refresh the materialized view. Some materialized views have status invali however, they compile with no errors. Some OLTP applications also benefit from materialized views involving non-volatile data. To the seat with the clearest view. This seems fairly clear in the documentation.

Did you tried to compile the materialized view ? 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. FROM tablet tabletwhere t1.

The tablehas a primary key and the MV was created succesfully but the primary key was not created in the materialized view table. Is there any other way to create MVs with primary keys? Oracle materialized views are one of the single most important SQL tuning tools and they are a true silver bullet, allowing you to pre-join complex views and pre-compute summaries for super-fast response time. 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. To alter the owner, you must also be a direct or indirect member of the new owning role. Oracle Database 12c allows for synchronous refreshes of the materialized views when configured to use a refresh method besides manual or on-demand. It utilizes partitioning and dependencies between the objects to minimize the time it takes to refresh and maintain the data as close to the underlying tables as possible. I need to put an index on a materialized view.

I do not know how often the stats are refreshed and would this effect it performance of the index or view ? You can see in the plan that Oracle uses the cust_sales_mv materialized view and joins it back to the customers table, using the cust_id column, which is part of the materialized view and represents the primary key-foreign key relationship between the sales and customers tables. Question: I have a materialized view where I want to manually refresh the materialization. How do I force a refresh of a materialized view ? Applies to: Oracle Database - Enterprise Edition - Version 9. Information in this document applies to any platform.