Materialized view log is a table associated with the master table of a materialized view. Specifies … Verify that what you are doing, in 11gR2 or 12c, is not an issue. Oracle Database can use this materialized view log to perform fast refreshes for all fast-refreshable materialized views based on the master table. Specify the name of the master table associated with the materialized view log to be dropped. As a consequence, costly full refreshes would be required on many (potentially large) MViews, in turn causing delays in availability. During this heavy hardworking, I faced with a problem on one of my customers. STORAGE. You may had to add WITH SEQUENCE to your log creation to cope with certain use as stated in Oracle documentation : Specify SEQUENCE to indicate that a sequence value providing additional ordering information should be recorded in the materialized view log. Materialized View Logs. Materialized views can be refreshed using COMPLETE, FAST, FORCE, ON DEMAND, or ON COMMIT, depending on the complexity of the materialized view. Drop table MY_MVIEW; And try to re-create the materialized view. If you omit schema, then Oracle Database assumes the materialized view log and master table are in your own schema. create table m (col1 number); create materialized view log … DROP MATERIALIZED VIEW [schema.]materialized_view_name. These materialized views include rowid materialized views, primary key materialized views, and subquery materialized views. You cannot execute a DROP MATERIALIZED VIEW statement on an object that is currently being used by another connection. create materialized view log on emp; create materialized view log on dept; Additionally, if you create the materialized view log with ROWID you should create the materialized view with rowid. i created a materialized view and log with the following query, create table test_mv (a number ,b number ) alter table test_mv add constraint t_pk primary key ( a ); insert into test_mv values (1,2); … This is the fastest way I could find, please let me know if anyone else has any ideas. To determine is a materialized view … Syntax DROP MATERIALIZED VIEW [ IF EXISTS] [ owner. Specify the schema containing the materialized view log and its master table. These materialized views include rowid materialized views, primary key materialized views, and subquery materialized views. SQL : SELECT * FROM ALL_OBJECTS WHERE OBJECT_NAME ='MY_MVIEW'; It should return 2 records, ojbect_type = TABLE and Object_type = MATERIALIZED VIEW. ORA-32417: must use DROP MATERIALIZED VIEW LOG. You can create a materialized view on a prebuild table. Materialized view log is a table associated with the master table of a materialized view. Oracle Database can use this materialized view log to perform fast refreshes for all fast-refreshable materialized views based on the master table. table ; “But her friend is nowhere to be seen Now she walks through her sunken dream To the seat with the clearest view...” ~ David Bowie (life on Mars) CREATE MATERIALIZED VIEW and ALTER MATERIALIZED VIEW for more information on materialized views, CREATE MATERIALIZED VIEW LOG for information on materialized view logs, Oracle Database Advanced Replication for information on materialized views in a replication environment, Oracle Database Data Warehousing Guide for information on materialized views in a data warehousing environment. tablename [ Physical_Attributes_Clause ] [TABLESPACE tablespace] [STORAGE Storage_Clause] Creates a materialized view log, which is a table associated with the master table of a materialized view used to control materialized view … DROP MATERIALIZED VIEW LOG ON order_lines; CREATE MATERIALIZED VIEW LOG ON order_lines WITH ROWID, SEQUENCE(order_id, line_qty, total_value) INCLUDING NEW VALUES; Materialized View CREATE/ALTER/DROP MATERIALIZED VIEW LOG CREATE MATERIALIZED VIEW LOG ON [ schema.] Oracle Database can use this materialized view log to perform fast refreshes for all fast-refreshable materialized views based on the master table. Specify SEQUENCE to indicate that a sequence value providing additional ordering information should be recorded in the materialized view log. But if its showing only one record with Object_type = Table then drop that table from database . These materialized views include rowid materialized views, primary key materialized views, and subquery materialized views. When changes are made to master table data, Oracle Database stores those changes description in the materialized view log and then uses the materialized view log to refresh materialized views based on the master table. Use the DROP MATERIALIZED VIEW LOG statement to remove a materialized view log from the database. When a materialized view log was dropped and recreated by using the script similar to this : CREATE MATERIALIZED VIEW LOG ON "XXX". Executing a DROP MATERIALIZED VIEW statement changes the status of all dependent regular views to INVALID. See Also: … Materialized Views in their various forms are a very potent way to shift efforts from the query to insert/update time of base data. Materialized View Logs. See Also: Oracle Database Data Warehousing Guide for a description of these types of materialized views… Materialized views are a really useful performance feature, allowing you to pre-calcuate joins and aggregations, which can make applications and reports feel more responsive. These materialized views include rowid materialized views, primary key materialized views, and subquery materialized views. 4 Comments: Ritzy said... You may find the following Metalink Link pretty useful as well. All indexes and keys for the materialized view … After you drop a materialized view log, some materialized views based on the materialized view log master table can no longer be fast refreshed. 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 layer. The default tablespace for the schema owner is the default. After you drop a materialized view log that was created FOR SYNCHRONOUS REFRESH (a staging log), the materialized views based on the staging log master table can no longer be synchronous refreshed. -- Check if the materialized view has nologging turned on SQL> SELECT logging FROM user_tables WHERE table_name = ‘SALES_MV’; LOG — NO-- Passing atomic_refresh will refresh the table with nologging if the materialized view is set to nologging SQL> exec dbms_mview.refresh(‘sales_mv’, … Physical_Attributes_Clause. Now I want to only drop that materialized view layer and preserve the underlying table. Re: Drop materialized view Centinul Nov 11, 2011 1:33 PM ( in response to 899419 ) You don't find a single command or call to do this. A master table can have only one materialized view log defined on it. This mechanism is called a Materialized View Log. Specify the schema containing the materialized view log and its master table. A materialized view log is located in the master database in the same schema as the master table. Specify the name of the master table associated with the materialized view log to be dropped. Hello Everyone, I couldn’t write for a long time because of a crazy workload. Simply truncating the Materialized View log may lead to otherwise healthy and up-to-date MViews to loose the capability to FAST REFRESH (due to the mismatch in last refresh timestamps). To drop a materialized view log, you must have the privileges needed to drop a table. This is called fast refreshing. I want to create a materialized view that filters it down to 50 million records but also uses REFRESH FAST ON COMMIT.To use REFRESH FAST I need a MATERIALIZED VIEW LOG on the base table.. and yes, we have a materialized view log which also includes the PK column :) A COMPLETE truncates the materialized view table and reloads it from scratch. Specifies the physical characteristics of this materialized view log. create materialized view empdept_mv refresh fast on commit WITH ROWID as select a.rowid dept_rowid, b.rowid emp_rowid, … If you intend to use the FAST refresh method, you must create the materialized view log … In an attempt to work around another problem, I have mistakenly dropped the underlying tables for a materialized view log, and now I can neither drop that log nor the MV relating to it. Also see these related notes on materialized view performance. This information allows a fast refresh, which only needs to apply the changes rather than a complete refresh of the materialized view. After you drop a materialized view log that was created FOR FAST REFRESH, some materialized views based on the materialized view log master table can no longer be fast refreshed. Materialized View Refresh : Log … SQL> SQL> GRANT SELECT … After you drop a materialized view log that was created FORFASTREFRESH, some materialized views based on the materialized view log master table can no longer be fast refreshed. Sequence numbers are necessary to support fast refresh after some update scenarios. To determine view dependencies before dropping a materialized view, use the sa_dependent_views system procedure. Materialized Views in Oracle. drop TABLE MTAS.MLOG$_1 cascade constraints; ORA-32417: must use DROP MATERIALIZED VIEW LOG. They have a on commit refresh Materialized View A materialized view log is located in the master database in the same schema as the master table. Specifies the name of the table for which the materialized view log will be maintained. Published on: 2019-12-06 by Mustafa Category:12c, Development, Materialized View Comment. > Can not Drop Materialized View on 12c and above? A FAST uses a materialized view log only to update changed rows. description in the materialized view log and then uses the materialized view log to refresh materialized views based on the master table. Special care on view log. Now I want to only drop that materialized view layer and preserve the underlying table. 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