]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. Materialized Views in Oracle. Using materialized views against remote tables is the simplest way to achieve replication of data between sites. 2 / Materialized view altered. Change the properties of an existing mview. INVALID Materialized View NEEDS_COMPILE This example was tested on Oracle 11.2. The word "snapshot" is synonymous with "materialized view". It shows how an on demand materialized view becomes invalid following DML on the underlying table. 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. We need a table to act as the source of the materialized view. Queries making direct references to a materialized view will not use the real-time materialized view functionality by default. ALTER MATERIALIZED VIEW. Syntax: ALTER MATERIALIZED VIEW [schema. Creates a materialized view (also called a snapshot), which is the result of a query run against one or more tables or views. ]mview … 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. SET HIDDEN clause Use the SET HIDDEN clause to obfuscate the definition of a materialized view. The rest of this article provides some simple examples of real-time materialized views. 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. A Refresh of a materialized view is a data operation. 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. 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. 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. 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. 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. 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. To alter the owner, you must also be a direct or indirect member of the new owning role, and that role … To use this functionality the query much use the FRESH_MV hint. This setting is irreversible.For more information, see Hiding materialized views.. ]mview options iot_options [USING INDEX index_options] [REFRESH [refresh_options]] [COMPILE | CONSIDER FRESH | {ENABLE|DISABLE} QUERY REWRITE] ALTER MATERIALIZED VIEW [schema. Setup. 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