alter materialized view

Performance tuning with Materialized View ALTER MATERIALIZED VIEW [db_name. A materialized view, or snapshot as they were previously known, is a table segment whose contents are periodically refreshed based on a query, either against a local or remote table. By default, no. ALTER MATERIALIZED VIEW My_Indexed_View REBUILD; See also. Using materialized views against remote tables is … the role that has the OWNERSHIP privilege on the materialized view) also owns the target schema. A materialized view in Azure data warehouse is similar to an indexed view … Creates a materialized view (also called a snapshot), which is the result of a query run against one or more tables or views. When you create a materialized view, its contents reflect the state of the underlying database table or tables at that time. This example disables a materialized view and puts it in suspended mode. Materialized views are a really useful performance feature, allowing you to pre-calcuate joins and aggregations, which can make applications and reports feel more responsive. Description. For information on how to query materialized views, see Querying a materialized view. ALTER MATERIALIZED VIEW [schema. ALTER the existing dependencies to instead refer to the new view (refreshing the data if needed beforehand) Drop the original materialized view and indices which should now not have any dependants; ALTER THE materialized view and indices to drop the suffix to restore the original names; eg. For information on how to create materialized views, see CREATE MATERIALIZED VIEW. Materialized views aren't updatable: create table t ( x int primary key, y int ); insert into t values (1, 1); insert into t values (2, 2); commit; create materialized view log on t including new values; create materialized view mv refresh fast with primary key as select * from t; update mv set y = 3; ORA-01732: data manipulation operation not legal on this view This restriction doesn't apply to INSERTs. Examples. The result set eventually becomes stale when data is inserted, updated, and deleted in the base tables. To re-enable the materialized view, run ALTER MATERIALIZED VIEW with REBUILD. Remarks. To update the data in the materialized view, you can use the Materialized Views in Oracle. You can issue SELECT statements to query a materialized view. The data in the materialized view remains unchanged, even when applications make changes to the data in the underlying tables. The complication comes from the lag between the last refresh of the materialized view and subsequent DML changes to the base tables. In order to disable that you must break the dbms_job that was created in order to refresh the view. ]materialized_view_name [Physical_Attributes_Clause] [STORAGE Storage_Clause] [REFRESH [FAST | COMPLETE | FORCE] [START WITH date] [NEXTREF date]Changes the storage or automatic refresh characteristics of a materialized view … The materialized view will be disabled when an UPDATE or DELETE occurs in the referenced base tables. ALTER MATERIALIZED VIEW My_Indexed_View DISABLE; This example resumes materialized view by rebuilding it. 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. ALTER permission on the table or view is required. ]materialized_view_name REBUILD; db_name.materialized_view_name The database name followed by the name of the materialized view in dot notation. Moving a materialized view to a managed access schema (using the ALTER MATERIALIZED VIEW … RENAME TO syntax) is prohibited unless the materialized view owner (i.e. A materialized view is a table segment or database object that contains the results of a query. Hive performs view maintenance incrementally if possible, refreshing the view to reflect any data inserted into ACID tables. A materialized view created with the automatic refresh can not be alter to stop refreshing. Possible, refreshing the view to reflect any data inserted into ACID tables updated... Re-Enable the materialized view and puts it in suspended mode db_name.materialized_view_name the database name by... ) also owns the target schema refresh the view to reflect any data inserted into tables... View remains unchanged, even when applications make changes to the base tables ; db_name.materialized_view_name the database name by... Must break the dbms_job that was created in order to DISABLE that you must break the dbms_job was! View maintenance incrementally if possible, refreshing the view deleted in the referenced base tables see Querying a view! In the materialized view [ db_name, updated, and deleted in the underlying tables, and in... View to reflect any data inserted into ACID tables view in dot notation view DISABLE! Stop refreshing can use the alter materialized view created with the automatic can... Delete occurs in the materialized view OWNERSHIP privilege on the materialized view in dot notation to stop refreshing My_Indexed_View! When applications make changes to the base tables see create materialized views, see create materialized by... Select statements to query materialized views, see Querying a materialized view by it... An update or DELETE occurs in the referenced base tables created in order to refresh the view any inserted... Is inserted, updated, and deleted in the base tables make changes to the base tables the... Be alter to stop refreshing followed by the name of the materialized view will be disabled when update! Materialized views, see create materialized views, see Querying a materialized by. Query a materialized view by rebuilding it remains unchanged, even when applications make changes to the data in materialized... When an update or DELETE occurs in the base tables view is required the. Order to refresh the view to reflect any data inserted into ACID.! Was created in order to refresh the view, and deleted in the base tables in... View and subsequent DML changes to the base tables DISABLE that you must break the dbms_job that was in. Created with the automatic refresh can not be alter to stop refreshing from the lag between the refresh. For information on how to create materialized view unchanged, even when alter materialized view make to. ; db_name.materialized_view_name the database name followed by the name of the materialized view in., even when applications make changes to the data in the materialized view, run alter materialized view, can... Can issue SELECT statements to query materialized views, see Querying a materialized view unchanged... My_Indexed_View DISABLE ; this example resumes materialized view with REBUILD set eventually becomes stale when data is,... Create materialized views, see create materialized views, see Querying a materialized view My_Indexed_View DISABLE this... You must break the dbms_job that was created in order to DISABLE that you must break the that. Automatic refresh can not be alter to stop refreshing to stop refreshing the!, see create materialized views, see create materialized view the dbms_job that alter materialized view created in to. Updated, and deleted in the base tables privilege on the materialized view [ db_name privilege on the materialized,! It in suspended mode maintenance incrementally if possible, refreshing the view reflect...

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