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_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 … INVALID Materialized View NEEDS_COMPILE This example was tested on Oracle 11.2. ]mview … 2 / Materialized view altered. Setup. Creates a materialized view (also called a snapshot), which is the result of a query run against one or more tables or views. This setting is irreversible.For more information, see Hiding materialized views.. Change the properties of an existing mview. Description. SET HIDDEN clause Use the SET HIDDEN clause to obfuscate the definition of a materialized view. 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 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. It shows how an on demand materialized view becomes invalid following DML on the underlying table. Syntax: ALTER MATERIALIZED VIEW [schema. The rest of this article provides some simple examples of real-time materialized views. ALTER MATERIALIZED VIEW. 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. 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. To alter the owner, you must also be a direct or indirect member of the new owning role, and that role … 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 First I created a table: ... SQL> alter materialized view mv1 compile. 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. Queries making direct references to a materialized view will not use the real-time materialized view functionality by default. Materialized Views in Oracle. ALTER MATERIALIZED VIEW [schema. 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. The word "snapshot" is synonymous with "materialized view". When you compile the MV, Oracle revalidates the query upon which the view is based. We need a table to act as the source of the materialized view. 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. A Refresh of a materialized view is a data operation. ]mview options iot_options [USING INDEX index_options] [REFRESH [refresh_options]] [COMPILE | CONSIDER FRESH | {ENABLE|DISABLE} QUERY REWRITE] ALTER MATERIALIZED VIEW [schema. Using materialized views against remote tables is the simplest way to achieve replication of data between sites. 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