how to drop materialized view in oracle 12c

Cause: An attempt was made to drop a materialized view using a command other than DROP MATERIALIZED VIEW. Goal. 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. Originally called snapshots, materialized views were introduced in Oracle8i and are only available in the Enterprise Edition. I have an issue with dropping materialized views. The underlying … alter materialized view view_name refresh on demand; This seems fairly clear in the documentation . I created a materialized view on top of a prebuilt table. A DROP statement sits there and never returns. my_group_1 now has three views in its group, mv_market_rate, mv_dealer_rate and mv_borrowing_rate ( the newly added view). Database: 12c Release 2 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. Now I want to only drop that materialized view layer and preserve the underlying table. The following is an example of an Oracle materialized view on prebuilt table with an ON COMMIT refresh: 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 … Action: Use the DROP MATERIALIZED VIEW command. 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. ]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 … 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: DBMS_REFRESH - Procedure SUBTRACT. And dropping them was taking a long time, as it tries to drop the data in both source and destination DB. I've been trying to DROP an MV which is defined as REFRESH ON DEMAND and there are no locks anywhere. 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. If a view is referenced by other views, materialized views, or synonyms, Oracle will mark these objects INVALID, but does not remove them. These MVs themselves are marked as INVALID. Oracle Database - Enterprise Edition - Version 10.2.0.3 and later Information in this document applies to any platform. Like a regular view, the data in a materialized view results … In Source DB it tries to purge the mview log and at … All of these views will be refreshed at an interval of 30 minutes. after a quick search, I learned that those are new tables which came with 12c and above. Removes a snapshot/materialized view from the already existing … But recompiling them never returns. -- 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 … 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. In this article, we discuss a feature of the Oracle Database that you can include in your arsenal: materialized views. 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 … No locks anywhere now I want to only drop that materialized view tries to drop MV... 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