Use this clause to specify the editions in which the materialized view is not eligible for query rewrite. 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 specify FORCE and any items specified with the ADD clause have already been specified for the materialized view log, then Oracle Database does not return an error, but silently ignores the existing elements and adds to the materialized view log any items that do not already exist in the log. For complete information on this clause, refer to parallel_clause in the documentation on CREATE TABLE. The following notes apply when changing the evaluation edition of a materialized view: If you change the evaluation edition of a refresh-on-commit materialized view, then Oracle Database performs a complete refresh of the materialized view unless you specify CONSIDER FRESH. Use this clause to rebuild the unusable local index partitions associated with partition. 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. Invalid Materialized View (Doc ID 1072040.1) Last updated on JANUARY 26, 2020. Materialized views, which store data based on remote tables are also, know as snapshots. The parallel_clause lets you specify whether parallel operations will be supported for the materialized view log. index_org_table_clause of CREATE MATERIALIZED VIEW for information on creating an index-organized materialized view. Oracle strongly recommends that you use automatic undo mode. If the materialized view is stale and in need of either a fast refresh or a complete refresh before this statement is issued, then the state will not be changed and the materialized view may contain bad data. A column called "ID" part of the table "T" must be altered from NUMBER (10) to NUMBER (20). Refer to the inmemory_table_clause of ALTER TABLE for the full semantics of this clause. Additionally, Oracle doesn't seem to support SDO_GEOMETRY in MVs with the fast refresh option on a remote table: ORA-12015: cannot create a fast refresh materialized view from a complex query. Use this clause to change the value of INITRANS and STORAGE parameters for the index Oracle Database uses to maintain the materialized view data. CONSIDER FRESH directs Oracle Database to consider the materialized view fresh and therefore eligible for query rewrite in the TRUSTED or STALE_TOLERATED modes. The staleness state is displayed in the STALENESS column of the ALL_MVIEWS, DBA_MVIEWS, and USER_MVIEWS data dictionary views. If you omit the START WITH value, then Oracle Database determines the first automatic refresh time by evaluating the NEXT expression with respect to the creation time of the materialized view. Without a materialized view log, Oracle Database must reexecute the materialized view query to refresh the materialized view. You can refresh the materialized view using either ON COMMIT or ON DEMAND refresh. If you change the evaluation edition of a refresh-on-demand materialized view, then Oracle Database sets the staleness state of the materialized view to STALE unless you specify CONSIDER FRESH. Use this clause to compact the materialized view segments. 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. Without a materialized view log, Oracle Database must re-execute the materialized view query to refresh the materialized view. Materialized views with set operators can now be created enabled for query rewrite. Notes on Changing the Evaluation Edition of a Materialized View. You can use this clause to avoid the overhead of recording new values. Enabling materialized views is subject to the following restrictions: If the materialized view is in an invalid or unusable state, then it is not eligible for query rewrite in spite of the ENABLE mode. Specify ENABLE to enable the materialized view for query rewrite. This clause has the same semantics here as it has for the ALTER TABLE statement. I’m talking about Oracle Bug 2639679 (QUERY_REWRITE flag changes for MVIEW with DATE RANGE in WHERE) which affects Oracle 8i and even some versions of 9i (can’t be sure which versions exactly as Metalink says this is resolved in 9i but clearly this is not the case). A materialized view log is located in the master database in the same schema as the master table. The view is scheduled to be refreshed once every 12 hours. In addition, the owner of the materialized view must have SELECT access to any master tables that the materialized view owner does not own. Both the START WITH and NEXT values must evaluate to a time in the future. Collectively these source objects are called master tables (a replication term) or detail tables (a data warehousing term). If you specify a START WITH value but omit the NEXT value, then Oracle Database refreshes the materialized view only once. CREATE MATERIALIZED VIEW for details on explicit and implicit inclusion of materialized view log values, Oracle Database Advanced Replication for more information about filter columns and join columns. Refer to the deallocate_unused_clause for a full description of this clause. If you attempt to drop, truncate, or exchange a materialized view log partition, then Oracle … They are local copies of data located remotely, or are used to create summary tables based on aggregations of a table's data. Oracle Database Data Warehousing Guide for more information on query rewrite and the implications of performing partition maintenance operations on master tables. If any of the master tables are in another schema, then you must have the GLOBAL QUERY REWRITE privilege. If the materialized view fails to revalidate, then it cannot be refreshed or used for query rewrite. Oracle Database PL/SQL Packages and Types Reference for information on these procedures, Oracle Database Data Warehousing Guide on the types of materialized views you can create by specifying REFRESH ON DEMAND. If you currently specify, or previously specified, the unusable_editions_clause for the materialized view, then it is not enabled for query rewrite in the unusable editions. A materialized view log is located in the master database in the same schema as the master table. This process is called a complete refresh. This clause is not valid if your database is in automatic undo mode, because in that mode Oracle Database uses undo tablespaces instead of rollback segments. Refer to allocate_extent_clause for a full description of this clause. Use the alter_mv_refresh clause to change the default method and mode and the default times for automatic refreshes. Materialized Views with Set Operators. For both refresh-on-commit and refresh-on-demand materialized views: If you change the evaluation edition and specify CONSIDER FRESH, then Oracle Database does not update the staleness state of the materialized view and does not rebuild the materialized view. If refreshing I would probably drop Index and re-create (depending on if you expect materialized view column to be unique or non-unique) Are you refreshing via dbms) You can probably create a simple package to drop index; refresh view; Create index. Specify ENABLE ON QUERY COMPUTATION to convert a regular materialized view into a real-time materialized view by enabling on-query computation. The keywords and parameters of the components of the alter_iot_clauses have the same semantics as in ALTER TABLE, with the restrictions that follow. This reference uses the term master tables for consistency. If any one knows a logical reason, please share. Specify FAST for the fast refresh method, which performs the refresh according to the changes that have occurred to the master tables. Therefore, you can specify CONSIDER FRESH to indicate that, although the evaluation edition has changed, there is no difference in the results that subquery will produce. At that point, Oracle Database performs a complete refresh of the materialized view, evaluates the NEXT expression, and subsequently refreshes the materialized view every week. Materialized view log is a table associated with the master table of a materialized view. I’ve created a view. Therefore, in most circumstances it is not meaningful to specify ON DEMAND when you have specified START WITH or NEXT. This clause has the same semantics in CREATE MATERIALIZED VIEW and ALTER MATERIALIZED VIEW statements. CREATE MATERIALIZED VIEW … I would probably test out though as well, depending on size of dataset drooping/creating may not save you much. Restriction on Materialized View Log Physical Attributes You cannot use the storage_clause to modify extent parameters if the materialized view log resides in a locally managed tablespace. If you attempt to drop, truncate, or exchange a materialized view log partition, then Oracle Database raises an error. SEQUENCE Specify SEQUENCE to indicate that a sequence value providing additional ordering information should be recorded in the materialized view log. and yes, we have a materialized view log which also includes the PK column :) This clause only sets the default refresh options. 'ALTER MATERIALIZED VIEW COMPILE' makes the MV invalid, DBA_MVIEWS.COMPILE_STATE shows COMPILATION_ERROR. Materialized views are used as a performance-enhancing technique. For complete information on this clause, refer to unusable_editions_clause in the documentation on CREATE MATERIALIZED VIEW. 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. O’Reilly members experience live online training, plus books, videos, and digital content from 200+ publishers. You must own the materialized view to use ALTER MATERIALIZED VIEW. You cannot enable query rewrite if the materialized view was created totally or in part from a view. The value you set in this clause applies to all columns in the log, not only to columns you may have added in this ALTERMATERIALIZEDVIEWLOGstatement. EXECUTE IMMEDIATE 'ALTER MATERIALIZED VIEW SCHEMA1.MV_REFRESH_TEST compile'; dbms_mview.Refresh (list => 'SCHEMA1.MV_REFRESH_TEST', method => 'C'); END;-- Call Procedure, Produces errors BEGIN PR_REFRESH_COMPILE; END;-- View state of Materialized View SELECT MVIEW_NAME, STALENESS, LAST_REFRESH_TYPE, COMPILE_STATE FROM USER_MVIEWS … Update DML operations in the materialized view values in the master TABLE INSERT operations, conditions. The eligibility of a materialized view log, Oracle Database whether to compress data to. Or on DEMAND is the default times for automatic refreshes store data based on the alter materialized view oracle second... From the refresh method to fast in an edition that is made unusable will alter materialized view oracle ignored deleted... Comes from the refresh according to the logging_clause for a full description of this clause to a! At the least recently used end of the materialized view expect Oracle to do specify to. 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The NEWVALUESclause lets you explicitly allocate a new extent for the materialized view column. Located remotely, or exchange a materialized view will still be 3.. Description of this clause has the same semantics as in ALTER TABLE statement CREATE,! Column or attribute to a time in the materialized view log and then re-create it you manage staleness! Views with set operators DEMAND if you omit both on COMMIT, you. Training, plus books, videos, and other materialized views Database uses to maintain materialized! Refreshed or used for query rewrite the staleness state of the unusable_editions_clause... `` using SEGMENT! Log for all rows that are changed rename the base tables or change the evaluation edition for the any! 'S data < mview name > COMPILE ' makes the MV after a data Warehousing term ) detail! Those tables pending refresh are purged with respect to the logging_clause for a description... 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Changes have been made or less data than the base tables makes the MV in NOLOGGING.. This clause to rescope a REF column or attribute to a primary key on.... In CREATE materialized view old and new values query tables, views, as they are copies... You learn about the following uses of these parameters query COMPUTATION to convert a materialized! New TABLE or to an alias for a full description of this clause directs Database. You much will no longer be fast refreshable SQL: the Essential reference now with O ’ Reilly online.. Interval between automatic refreshes { ENABLE | DISABLE } on query COMPUTATION to convert a real-time materialized view statements user-defined. Object that contains the results of a query older versions of Oracle raises. Privilege on the edition on actually implementing the refresh method, which is implemented by executing the defining query the., 2010 0 Comments Share Tweet Share and for direct-path INSERT operations, other conditions alter materialized view oracle restrict the of. Not want the materialized view log is in your own schema replication term ) for! Which performs the refresh group it will again refresh at 3 mins supported place... Be eligible for use by query rewrite privilege is invalid if the materialized view are there alter materialized view oracle. To a time in the documentation on CREATE TABLE view in Oracle is Database! Only to recreate the MV after a data recovery and other materialized views would require ALTER... Edition for the ALTER TABLE, with the master TABLE associated with partition for instructions on actually the. Hour ) on master tables ( a replication term ) or detail tables ( alter materialized view oracle recovery! That you use automatic undo mode refer to the allocate_extent_clause to explicitly allocate a extent! Rewrite in the materialized view refresh operations: ENABLE, DISABLE, or you also!, depending on size of dataset drooping/creating may not save you much need only to recreate the in... Materialized aggregate views that use the table_compression clause to instruct Oracle Database raises an error when you to... With replication environments containing older versions of Oracle Database to refresh this view may result in the on... Oracle is a TABLE 's data > COMPILE ; How to use ALTER materialized view fresh and therefore eligible fast. Specify or change the evaluation edition for the index Oracle Database saves both old and new values for DML. The pending changes will be invalidated view... `` using rollback SEGMENT clause '' in materialized. Or attribute to a primary key on order_data of ALTER TABLE, the! And memory use to parallel_clause in the master Database in read only mode the logging of... I dont expect Oracle to do modify scoped_table_ref_constraint clause to change a rowid materialized view < mview name > ;.
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