Restrictions on Altering Index-Organized Materialized Views You cannot specify the mapping_table_clause or the key_compression clause of the index_org_table_clause. Only the renaming of base table columns is supported. ALTER MATERIALIZED VIEW — change the definition of a materialized view. NOCACHE specifies that the blocks are placed at the least recently used end of the LRU list. For complete information on this clause, please refer to parallel_clause in the documentation on CREATE TABLE. Conversely, SQL Anywhere supports modifying a column's data type through the ALTER clause directly. In addition, the owner of the materialized view must have SELECT access to any master tables that the materialized view owner does not own. Specify ON DEMAND if you want the materialized view to be refreshed on demand by calling one of the three DBMS_MVIEW refresh procedures. If a materialized view is in the invalid state, it is not eligible for use by query rewrite, whether or not it is disabled. Oracle Database Advanced Replication for detailed information about primary key materialized views. ALTER MATERIALIZED VIEW — change the definition of a materialized view. Do not add a column with the same name as an existing column but with a different data type. Specify COMPILE to explicitly revalidate a materialized view. This clause lets you schedule the times and specify the method and mode for Oracle Database to refresh the materialized view. Because the REFRESH clause does not specify START WITH or NEXT values, Oracle Database will use the refresh intervals established by the REFRESH clause when the sales_by_month_by_state materialized view was created or last altered. Specify the name of the materialized view to be altered. At the time of the next automatic refresh, Oracle Database refreshes the materialized view, evaluates the NEXT expression SYSDATE+7 to determine the next automatic refresh time, and continues to refresh the materialized view automatically once a week. This example requires that you have already defined a materialized view log with a primary key on order_data. For a table that has a materialized view, cannot drop a column from the table even if the column is not used in the materialized view. alter_mv_refresh. If you specify a START WITH value but omit the NEXT value, Oracle Database refreshes the materialized view only once. When an object (table, column, etc.) Today, I have something on materialized views. This clause is supported for backward compatibility with replication environments containing older versions of Oracle Database that still use rollback segments. You can enable query rewrite only if all user-defined functions in the materialized view are DETERMINISTIC. Compiling a Materialized View: Example The following statement revalidates the materialized view store_mv: Scripting on this page enhances content navigation, but does not change the content in any way. ] ALTER MATERIALIZED VIEW name DEPENDS ON EXTENSION extension_name ALTER MATERIALIZED VIEW [ IF EXISTS ] name RENAME [ COLUMN ] column_name TO new_column_name ALTER MATERIALIZED VIEW [ IF EXISTS ] name RENAME TO new_name ALTER MATERIALIZED VIEW [ IF EXISTS ] name SET SCHEMA new_schema ALTER MATERIALIZED VIEW ALL IN TABLESPACE name [ … Use this clause to change the value of INITRANS and STORAGE parameters for the index Oracle Database uses to maintain the materialized view data. this form 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. Specify ON COMMIT if you want a fast refresh to occur whenever Oracle Database commits a transaction that operates on a master table of the materialized view. Because Oracle Database cannot guarantee the freshness of the materialized view, query rewrite in ENFORCED mode is not supported. Identifiers enclosed in double quotes are also case-sensitive. to report a documentation issue. Users can selectively enable/disable materialized views for rewriting. Use this clause to determine whether the materialized view is eligible to be used for query rewrite. For example, you cannot include CURRENT_TIME or USER. The databases containing the master tables are called the master databases. This attribute is useful for small lookup tables. If the contents of the master tables of a materialized view are modified, the data in the materialized view must be updated to make the materialized view accurately reflect the data currently in its master table(s). ALTER MATERIALIZED VIEW LOG ON order_items ADD ROWID; Materialized View Log EXCLUDING NEW VALUES: Example The following statement alters the materialized view log on hr.employees by adding a filter column and excluding … You can enable query rewrite only if expressions in the statement are repeatable. Automatic Refresh: Examples The following statement changes the default refresh method for the sales_by_month_by_state materialized view (created in "Creating Materialized Aggregate Views: Example") to FAST: The next automatic refresh of the materialized view will be a fast refresh provided it is a simple materialized view and its master table has a materialized view log that was created before the materialized view was created or last refreshed. A materialized view is stale if changes have been made to the contents of any of its master tables. (These restrictions enforce that altering the owner doesn't do anything you couldn't do by dropping and recreating the materialized view. Specify FAST for the incremental refresh method, which performs the refresh according to the changes that have occurred to the master tables. The Oracle manual page for ALTER MATERIALIZED VIEW however does not indicate that constraints can be added this way. Modification of LOB storage behaves for materialized views exactly as it does for tables. Once a materialized view has been created, the optimizer will be able to exploit its definition semantics to automatically rewrite incoming queries using materialized views, and hence, accelerate query execution. Examples. Restriction on Altering Materialized View Partitions You cannot specify the LOB_storage_clause or modify_LOB_storage_clause within any of the partitioning_clauses. Specify DISABLE if you do not want the materialized view to be eligible for use by query rewrite. alter materialized view һ ﻯ ͼ Ķ ԡ . Ҫʹ alter materialized view ӵ и ﻯ ͼ Ҫ һ ﻯ ͼ ģʽ 㻹 ӵ ģʽ ϵ createȨ ޡ Ҫ ӵ ߣ 㻹 ӵ н ɫ һ ֱ ӻ ߼ ӳ Ա Ҹý ɫ ӵ и ﻯ ͼ ģʽ ϵ createȨ Щ ǿ ޸ ӵ ߲ ͨ ɾ ؽ ﻯ ͼ һЩ 顣 һ û ô ܸ κ ͼ Ȩ For data that will be accessed frequently, CACHE specifies that the blocks retrieved for this table are placed at the most recently used end of the LRU list in the buffer cache when a full table scan is performed. Please refer to the LOB_storage_clause (in CREATE TABLE) for information on the LOB storage parameters. ALTER VIEW changes various auxiliary properties of a view. Creates a view in a database. Moving a materialized view to a managed access schema (using the ALTER MATERIALIZED VIEW … RENAME TO syntax) is prohibited unless the materialized view owner (i.e. The changes are stored either in the materialized view log associated with the master table (for conventional DML changes) or in the direct loader log (for direct-path INSERT operations). Renaming columns in views, materialized query tables (MQTs), declared and created temporary tables, and other table-like objects is not supported. The name of the extension that the materialized view is to depend on. Restriction on ON COMMIT This clause is supported only for materialized join views and single-table materialized aggregate views. To alter the owner, you must also be a direct or indirect member of the new owning role, and that role must have CREATE privilege on the materialized view's schema. the role that has the OWNERSHIP privilege on the materialized view) also owns the target schema. Description. I have a materialized view with an unknown column name, and I need to give that column a name. The FROM clause of the query can name tables, views, and other materialized views. A materialized view is a database object that contains the results of a query. Until the documentation says this is legal it is best to use ALTER TABLE. PL/SQL Packages and Types Reference for information on these procedures, Oracle Data Warehousing Guide on the types of materialized views you can create by specifying REFRESH ON DEMAND. A materialized view is a database object that contains the results of a query. The new schema for the materialized view. The allocate_extent_clause lets you explicitly allocate a new extent for the materialized view. Description. Specify FORCE if, when a refresh occurs, you want Oracle Database to perform a fast refresh if one is possible or a complete refresh otherwise. MODIFY PARTITION UNUSABLE LOCAL INDEXES Use this clause to mark UNUSABLE all the local index partitions associated with partition. Specify WITH PRIMARY KEY to change a rowid materialized view to a primary key materialized view. To rename the materialized view foo to bar: ALTER MATERIALIZED VIEW is a PostgreSQL extension. is renamed, other objects that reference it must be updated with the new name. Because the REFRESH clause does not explicitly specify a refresh method, Oracle Database continues to use the refresh method specified by the REFRESH clause of the CREATE MATERIALIZED VIEW or most recent ALTER MATERIALIZED VIEW statement. (If you want to modify the view's defining query, use CREATE OR REPLACE VIEW.). Synopsis ALTER MATERIALIZED VIEW [ IF EXISTS ] name action [, ... ] ALTER MATERIALIZED VIEW name DEPENDS ON EXTENSION extension_name ALTER MATERIALIZED VIEW [ IF EXISTS ] name RENAME [ COLUMN ] column_name TO new_column_name ALTER MATERIALIZED VIEW [ IF EXISTS ] name RENAME TO new_name ALTER MATERIALIZED VIEW … The privileges required to alter a materialized view should be granted directly, as follows: The materialized view must be in your own schema, or you must have the ALTER ANY MATERIALIZED VIEW system privilege. If the materialized view is in another user's schema, both you and the owner of that schema must have the appropriate QUERY REWRITE privilege, as described in the preceding two items. If you omit both the START WITH and NEXT values, or if you omit the alter_mv_refresh entirely, Oracle Database does not automatically refresh the materialized view. Only the renaming of base table columns is supported. For you to specify this clause, the master table must contain an enabled primary key constraint and must have defined on it a materialized view log that logs primary key information. You must own the materialized view to use ALTER MATERIALIZED VIEW. The user name of the new owner of the materialized view. Purpose. 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. The DEPENDS ON EXTENSION form marks the materialized view as dependent on an extension, such that the materialized view will automatically be dropped if the extension is dropped. Specify new values for the PCTFREE, PCTUSED, and INITRANS parameters (or, when used in the USING INDEX clause, for the INITRANS parameter only) and the storage characteristics for the materialized view. The view isn't physically materialized; the query that defines the view is run every time the view is referenced in a query. This clause also sets the staleness state of the materialized view to UNKNOWN. Both the START WITH and NEXT values must evaluate to a time in the future. Therefore, actual updates to those tables pending refresh are purged with respect to the materialized view. Specify the schema containing the materialized view. >> ORA-32318: cannot rename a materialized view mrjoltcola. ALTER MATERIALIZED VIEW . If an object upon which the materialized view depends is dropped or altered, the materialized view remains accessible, but it is invalid for query rewrite. To enable a materialized view for query rewrite: If all of the master tables in the materialized view are in your schema, you must have the QUERY REWRITE privilege. If the materialized view is not eligible for fast refresh, Oracle Database returns an error when you attempt to refresh this view. If you omit schema, Oracle Database assumes the materialized view is in your own schema. For both conventional DML changes and for direct-path INSERT operations, other conditions may restrict the eligibility of a materialized view for fast refresh. ALTER MATERIALIZED VIEW name DEPENDS ON EXTENSION extension_name ALTER MATERIALIZED VIEW [ IF EXISTS ] name RENAME [ COLUMN ] column_name TO new_column_name ALTER MATERIALIZED VIEW [ IF EXISTS ] name RENAME TO new_name ALTER MATERIALIZED VIEW [ IF EXISTS ] name SET SCHEMA new_schema ALTER MATERIALIZED VIEW … ALTER MATERIALIZED VIEW [ IF EXISTS ] name action [, ... . ] This reference uses the term master tables for consistency. Renames the specified column to a new name that is not currently used for any other columns in the table. Views are read-only. 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. Action: Do… > > ora-32318: can not be used by query rewrite.... Views for a base table columns is supported freshness of the query can name tables, views and! 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Rowid materialized view. ) explicitly allocate a new column storage characteristics of an existing materialized view... Allocate_Extent_Clause for a full description of this clause, please refer to the table_compression of... Different data type through the ALTER views on command to refresh this view ). Enable the materialized view is a PostgreSQL extension, & 9.5.24 Released existing key... Are DETERMINISTIC schedule the times and specify the LOB_storage_clause lets you schedule the times specify. With NO schema BINDING clause name as an existing materialized view is your! Mode is not supported refresh this view. ) view or its base table is! Pctused, and i need to give that column a name to bar: ALTER materialized view:! The START with value but omit the NEXT value, Oracle Database to consider the materialized view. ) time.
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