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: Suppose there are materialized views mv_t1, Mv_t2, Mv_t3. The syntax for creating the refresh group is as follows: [SQL] View plaincopy Sql> EXEC Dbms_refresh. Make (' Rep_test ', ' mv_t1,mv_t2,mv_t3 ', Sysdate, ' sysdate+ 1 ') --Refreshes the entire refresh group group: Sql> EXEC Dbms_refresh. REFRESH (' Rep_test ') 7. Delete materialized views and logs
be performed during refresh. If yes, it adopts the FAST method; otherwise, it adopts the COMPLETE method. NEVER indicates that the materialized view is not refreshed. You can modify the refresh method of the created materialized view. For example, you can change the refresh method of the
The materialized view concept is similar to the summary table in discoverer. At the discoverer management end, you can create a different summary table. In the discoverer query, discoverer first parse the query to determine whether the query can use the corresponding summary table, if you can, will rewrite the query to query the corresponding summary table.An exampleWith the following example, the use of
contains an external connection, the unique constraint must exist in the connection column of the table in the connection; 4. If no external connection is included, there is no restriction on the where statement. If an external connection is included, the where statement can only use and can only use "=. 5. The rowid of all tables in the From Statement List must appear in the SELECT statement list. 6. All Tables in the from Statement List must create a mate
The quick refresh mechanism of Oracle materialized view is completed by materialized view logs. How can Oracle quickly refresh multiple materialized views through a materialized view
the Materialized View) 5. Create a materialized view on the statistics View 5. Use the following command to create an instance: 1. Create a DB link -- Drop existing database link Drop
efficiency is improved. Of course, you must enable the query rewrite option; Material View 1. There is a time difference between two databases for data synchronization. 2. If the database is remotely connected, the query speed is improved. (Because the query logic is complex and the data volume is large, the query speed is slow and the efficiency is low each time you query a view) Refresh methods and meth
| test_kenyon | table | postgres | 16 kB | (2 rows) postgres = # select * from mv_test_kenyon; ERROR: materialized view "mv_test_kenyon" has not been populatedHINT: Use the refresh materialized view command. When REFRESH with no data is used, the data in the materialized
whether it can be refreshed quickly, or if it can be fast, or else complete. Never refers to materialized views without any refreshes. For a materialized view that has already been created, you can modify its refresh mode, such as modifying the materialized view Mv_name to
The quick refresh mechanism of Oracle materialized view is completed by materialized view logs. How can Oracle quickly refresh multiple materialized views through a materialized view
materialized view command. When REFRESH with no data is used, the data in the materialized view is cleared and the materialized view is unavailable. to continue using the refresh materialized
Materialized View Force: Oracle determines whether a quick Refresh can be performed during refresh. If yes, it adopts the fast method; otherwise, it adopts the complete method. Never indicates that the materialized view is not refreshed. The default value is force on demand. 4. Create a
, must be set into a CBO in some way.To disable materialized views:Modify the query_rewrite_enabled parameter of the Init.ora parameter to Flase and restart the instance.Use alter system set query_rewrite_enabled = flase, dynamic modification.Use alter session set query_rewrite_enabled = Flash; Modify the session within.Use the Norewrite hint.--------------------------------------------------------------------------------------SOURCE host: Y, target h
other database.2. Create Oracle materialized view Fast Refresh LogAs mentioned above, the refresh of the view will take the form of an incremental refresh, so to accommodate incremental refreshes, Oracle requires that the materialized view
purification routine (what is data purification? One of the components of a data warehouse is "data extraction, data purification, data loading", which may beThe data purification mentioned in may mean that the data has been purified before the data is loaded into the database, and there will be no data integrity ).The following is an example to simulate the process of loading data into the database,The data has been purified first, then the constraints are discarded, the data is loaded, the
Tags: order must be upd submit effective and ant ext also needPossible causes for Oracle materialized view refresh failure: 1. View does not establish materialized view log 2. The base table is authorized to the user 1.
4.3 create a materialized view to synchronize data 4.3.1 run the following command on the source user to create a materialized view log Note: For tables with primary keys defined, execute the following SQL: Create materialized
When refresh fast on demand is used to incrementally refresh the materialized view, the conventional creation step is to first create the materialized view log on the source database, and then create the materialized
at the same time, you must use commas to connect the names of materialized views. Each view must specify the refresh method f, incremental refresh, and c. Completely refresh ,? , Force refresh ). 2. After the log and materialized view are created on the current day, delete
In recent days, I am responsible for the P project environment to provide a view of the W system, due to complex query logic, data volume is large, resulting in each query view time, query slow, inefficient, by the W system personnel complaints. Think, or change to materialized view, with
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