ALTER MATERIALIZED VIEW changes various auxiliary properties of an existing materialized view.. You must own the materialized view to use ALTER MATERIALIZED VIEW.To change a materialized view's schema, you must also have CREATE privilege on the new schema. To alter the owner, you must also be a direct or indirect member of the new owning role, and that role … SQL> select 'alter materialized view ' || mview_name || ' compile' from user_mviews where compile_state<>'VALID'; Until the problem is diagnosed and fixed, you could keep recompiling the MVs maybe by using a scheduled job. Materialized Views in Oracle. 2 / Materialized view altered. ALTER MATERIALIZED VIEW. It shows how an on demand materialized view becomes invalid following DML on the underlying table. Using materialized views against remote tables is the simplest way to achieve replication of data between sites. 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. Setup. The data in the MV is brought up to date as specified when the view was created, e.g., fast refresh, complete refresh, etc. ENABLE clause Use the ENABLE clause to enable a disabled materialized view, making it available for the database server to use.This clause has no effect on a view that is already enabled. ]mview … We need a table to act as the source of the materialized view. The word "snapshot" is synonymous with "materialized view". Queries making direct references to a materialized view will not use the real-time materialized view functionality by default. ALTER MATERIALIZED VIEW mview_name COMPILE; The state of a materialized view can be checked by querying the data dictionary views USER_MVIEWS or ALL_MVIEWS. ]mview options iot_options [USING INDEX index_options] [REFRESH [refresh_options]] [COMPILE | CONSIDER FRESH | {ENABLE|DISABLE} QUERY REWRITE] ALTER MATERIALIZED VIEW [schema. To use this functionality the query much use the FRESH_MV hint. Description. Creates a materialized view (also called a snapshot), which is the result of a query run against one or more tables or views. The rest of this article provides some simple examples of real-time materialized views. So objects may go invalid in case of deployments of new objects , alter table command, packages,views, synonyms.Now lets find out how to find the invalid objects in the Oracle database and then how to compile invalid objects in oracle ALTER MATERIALIZED VIEW mview_name COMPILE; The state of a materialized view can be checked by querying the data dictionary views USER_MVIEWS or ALL_MVIEWS. SET HIDDEN clause Use the SET HIDDEN clause to obfuscate the definition of a materialized view. First I created a table: ... SQL> alter materialized view mv1 compile. Syntax: ALTER MATERIALIZED VIEW [schema. ]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 … ALTER MATERIALIZED VIEW [schema. A Refresh of a materialized view is a data operation. Change the properties of an existing mview. The column STALENESS will show one of the values FRESH, STALE, UNUSABLE, UNKNOWN, UNDEFINED, or NEEDS_COMPILE to indicate whether the materialized view can be used. The column STALENESS will show one of the values FRESH, STALE, UNUSABLE, UNKNOWN, UNDEFINED, or NEEDS_COMPILE to indicate whether the materialized view can be used. INVALID Materialized View NEEDS_COMPILE This example was tested on Oracle 11.2. When you compile the MV, Oracle revalidates the query upon which the view is based. Oracle database is a complex system and objects are inter-related and have dependencies.Like a package may depends on certain oracle table or view or synonym. This setting is irreversible.For more information, see Hiding materialized views.. Following DML on the underlying table use this functionality the query much use the real-time materialized views the! 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