What privilege is required for materialized view?
To create a materialized view in another user’s schema: You must have the CREATE ANY MATERIALIZED VIEW system privilege. The owner of the materialized view must have the CREATE TABLE system privilege.
How do you automate a materialized view refresh?
Set the initialization parameters and bounce the database. Create the materialized view table. Here, we specify that the materialized view will be refreshed every two hours with the refresh fast option. Instead of using DBMS_MVIEW, you can automatically refresh the MVIEW (Snapshot) using Oracle DBMS_JOB Management.
What is Rowid materialized view?
A ROWID materialized view is based on the physical row identifiers (rowids) of the rows in a master. ROWID materialized views can be used for materialized views based on master tables that do not have a primary key, or for materialized views that do not include all primary key columns of the master tables.
How do I view materialized view logs?
all_mview_logs will show you all the materialized view logs that you have access to. user_mview_logs will show you all the materialized view logs that you own.
How do you refresh a materialized view in Oracle?
- Query Rewrite Method 1: Text Match Rewrite.
- Query Rewrite Method 2: Join Back.
- Query Rewrite Method 3: Aggregate Computability.
- Query Rewrite Method 4: Aggregate Rollup.
- Query Rewrite Method 5: Rollup Using a Dimension.
- Query Rewrite Method 6: When Materialized Views Have Only a Subset of Data.
How do I stop a materialized view from refreshing?
A materialized view created with the automatic refresh can not be alter to stop refreshing. In order to disable that you must break the dbms_job that was created in order to refresh the view. Mview are local copies of data located remotely, or are used to create summary tables based on aggregations of a table’s data.
How do I manually refresh a materialized view in Oracle?
are you using exec DBMS_MVIEW. REFRESH(‘v_materialized_foo_tbl’); or exec MAT_VIEW_FOO_TBL or BEGIN DBMS_MVIEW. REFRESH(‘v_materialized_foo_tbl’); END;? Any of these should work.
How do you check if materialized view is refreshed or not?
select * from dba_refresh;select * from dba_refresh_children; select * from sys. v_$mvrefresh; Then below query to find the status of job.
Does a materialized view need a primary key?
Primary key materialized views allow materialized view master tables to be reorganized without affecting the eligibility of the materialized view for fast refresh. The master table must contain an enabled primary key constraint.
What is the difference between object and Rowid materialized view?
2) Another difference between View vs materialized view is that, when we create a view using any table, rowid of view is the same as the original table but in the case of Materialized view rowid is different.
Where are Oracle materialized views stored?
Unlike an ordinary view, which does not take up any storage space or contain any data, a materialized view contains the rows resulting from a query against one or more base tables or views. A materialized view can be stored in the same database as its base tables or in a different database.
What is Oracle materialized view log?
In an Oracle database, a materialized view log is a table associated with the master table of a materialized view. When master table data undergoes DML changes (such as INSERT, UPDATE, or DELETE), the Oracle database stores rows describing those changes in the materialized view log.
Where is the materialized view log in Oracle?
A materialized view log is located in the master database in the same schema as the master table. A master table can have only one materialized view log defined on it. Oracle Database can use this materialized view log to perform fast refreshes for all fast-refreshable materialized views based on the master table.
What happens when you drop a materialized view in Oracle?
If Oracle cannot successfully unregister a materialized view when you drop the materialized view, then the registration information for the materialized view persists in the master site or master materialized view site until it is manually unregistered. It is possible that complex materialized views might not be registered.
What is a materialized view?
A materialized view is a database object that contains the results of a query. The FROM clause of the query can name tables, views, and other materialized views. Collectively these objects are called master tables (a replication term) or detail tables (a data warehousing term). This reference uses “master tables” for consistency.
What privileges are required to create a materialized view log?
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. If you own the master table, then you can create an associated materialized view log if you have the CREATE TABLE privilege.