In this article, we discuss a feature of the Oracle Database that you can include in your arsenal: materialized views. Action: Use the DROP MATERIALIZED VIEW command. And dropping them was taking a long time, as it tries to drop the data in both source and destination DB. ALTER MATERIALIZED VIEW [schema. I have an issue with dropping materialized views. my_group_1 now has three views in its group, mv_market_rate, mv_dealer_rate and mv_borrowing_rate ( the newly added view). Like a regular view, the data in a materialized view results … ]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 … -- View state of Materialized View, Still reports compilation errors SELECT MVIEW_NAME, STALENESS, LAST_REFRESH_TYPE, COMPILE_STATE FROM USER_MVIEWS WHERE MVIEW_NAME LIKE 'MV_%' ORDER BY MVIEW_NAME ; -- Alternate Materialized View using only tables within the SCHEMA1 schema works … I created a materialized view on top of a prebuilt table. DBMS_REFRESH - Procedure SUBTRACT. Cause: An attempt was made to drop a materialized view using a command other than DROP MATERIALIZED VIEW. Goal. A Materialized View can be refreshed in two ways: - Full refresh: This re-evaluates the defining query of the MView and stores the result in the base table underlying the MView. after a quick search, I learned that those are new tables which came with 12c and above. Oracle Database - Enterprise Edition - Version 10.2.0.3 and later Information in this document applies to any platform. All of these views will be refreshed at an interval of 30 minutes. A complete refresh occurs when the Oracle materialized view is initially defined, unless it references a prebuilt table, and a complete refresh may be requested at any time during the life of the Oracle materialized view. I attempted to use PRESERVE TABLE clause from the information in this link, but it still deletes all the rows and returns only the template of the table after deleting the materialized view … I've been trying to DROP an MV which is defined as REFRESH ON DEMAND and there are no locks anywhere. Originally called snapshots, materialized views were introduced in Oracle8i and are only available in the Enterprise Edition. If a view is referenced by other views, materialized views, or synonyms, Oracle will mark these objects INVALID, but does not remove them. A DROP statement sits there and never returns. alter materialized view view_name refresh on demand; This seems fairly clear in the documentation . The underlying … The following is an example of an Oracle materialized view on prebuilt table with an ON COMMIT refresh: These MVs themselves are marked as INVALID. Oracle stores some statistical information on them by default but they have no indexes and when you tried to drop an MV oracle try to delete those tables for that MV but because lack of indexes (probably) it gets an internal … Removes a snapshot/materialized view from the already existing … Now I want to only drop that materialized view layer and preserve the underlying table. If you really want to permanently disable refresh, even manually, so you're left with the current contents and they can not be updated from the view query, you can drop the materialized view but keep the backing table: Recently I had to drop a couple of large Materialized View. 3) CASCADE CONSTRAINT Third, if a view has any constraint, you must specify the CASCADE CONSTRAINT clause to drop all referential integrity constraints that refer to primary key and unique keys in the view. Creates a materialized view (also called a snapshot), which is the result of a query run against one or more tables or views. Related Definitions: Materialized View Log: When DML changes are made to master table data, Oracle Database stores rows describing those changes in the materialized view log and then uses the materialized view log to refresh materialized views based on the master table. Database: 12c Release 2 But recompiling them never returns. 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