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