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. To change a materialized view's schema, you must also have CREATE privilege on the new schema. Use this clause to rebuild the unusable local index partitions associated with partition. Therefore, actual updates to those tables pending refresh are purged with respect to the materialized view. Now, this is what I dont expect Oracle to do. 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. A column called "ID" part of the table "T" must be altered from NUMBER (10) to NUMBER (20). A materialized view is a database object that contains the results of a query. Specify FAST for the fast refresh method, which performs the refresh according to the changes that have occurred to the master tables. When you change the refresh method to FAST in an ALTER MATERIALIZED VIEW statement, Oracle Database does not perform this verification. However, the interval setting in the materialized view will still be 3 mins. A materialized view log is located in the master database in the same schema as the master table. I think the solution is to recreate the MV in NOLOGGING mode. CREATE MATERIALIZED VIEW LOG for information on creating a materialized view log, ALTER MATERIALIZED VIEW for more information on materialized views, including refreshing them, CREATE MATERIALIZED VIEW for a description of the various types of materialized views. (physical_attributes_clause::=, modify_mv_column_clause::=, table_compression::=, inmemory_table_clause::=, LOB_storage_clause::=, modify_LOB_storage_clause::=, alter_table_partitioning::= (part of ALTER TABLE), parallel_clause::=, logging_clause::=, allocate_extent_clause::=, deallocate_unused_clause::=, shrink_clause::=, alter_iot_clauses::=, scoped_table_ref_constraint::=, alter_mv_refresh::=, evaluation_edition_clause::=, alter_query_rewrite_clause::=), (inmemory_attributes::=, inmemory_column_clause::=), (inmemory_memcompress::=, inmemory_priority::=, inmemory_distribute::=, inmemory_duplicate::=), (TABLESPACE SET: not supported with ALTER MATERIALIZED VIEW, LOB_parameters::=, storage_clause::=), (storage_clause::=, LOB_retention_clause::=, LOB_compression_clause::=, logging_clause::=, allocate_extent_clause::=, shrink_clause::=, deallocate_unused_clause::=), (index_org_table_clause::=, alter_overflow_clause::=, alter_mapping_table_clauses: not supported with materialized views), (mapping_table_clause: not supported with materialized views, prefix_compression: not supported for altering materialized views, index_org_overflow_clause::=), (segment_attributes_clause::=—part of ALTER TABLE), (allocate_extent_clause::=, shrink_clause::=, deallocate_unused_clause::=), (segment_attributes_clause::=--part of ALTER TABLE). 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. Specify START WITH date to indicate a date for the first automatic refresh time. The LOB_storage_clause lets you specify the storage characteristics of a new LOB. index_org_table_clause of CREATE MATERIALIZED VIEW for information on creating an index-organized materialized view. Cursors that use the materialized view for query rewrite and were compiled in an edition that is made unusable will be invalidated. alter synonym compile; alter public synonym compile; In-case you are doing compilation with DBA user, we need to put the owner name in these alteration command. You must own the materialized view to use ALTER MATERIALIZED VIEW. This clause has the same semantics in CREATE MATERIALIZED VIEW and ALTER MATERIALIZED VIEW statements. when rename of table is possible, then why not rename of mat view possible? You can refresh the materialized view using either ON COMMIT or ON DEMAND refresh. 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. Typically, each expression is the name of a column in the materialized view. Restrictions on Enabling Materialized Views. You can use this clause to explicitly revalidate the materialized view to make it eligible for query rewrite. A materialized view in Oracle is a database object that contains the results of a query. You cannot specify both ON COMMIT and ON DEMAND. This reference uses the term master tables for consistency. Prejoining tables 3. Refer to the CREATE TABLE clause encryption_spec for information on this clause. For complete information on this clause, refer to { ENABLE | DISABLE } ON QUERY COMPUTATION in the documentation on CREATE MATERIALIZED VIEW. Restriction on Materialized View Log Physical Attributes, Restrictions on Altering Materialized View Log Partitions, Restriction on Augmenting Materialized View Logs, Materialized View Log EXCLUDING NEW VALUES: Example, Description of the illustration alter_materialized_view_log.gif, Description of the illustration physical_attributes_clause.gif, Description of the illustration allocate_extent_clause.gif, Description of the illustration shrink_clause.gif, Description of the illustration parallel_clause.gif, Description of the illustration new_values_clause.gif, "Materialized View Log EXCLUDING NEW VALUES: Example". 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. For instructions on actually implementing the refresh, refer to Oracle Database Administrator’s Guide and Oracle Database Data Warehousing Guide. 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. This process is called a complete refresh. Materialized Views in Oracle A materialized view, or snapshot as they were previously known, is a table segment whose contents are periodically refreshed based on a query, either against a local or remote table. If any one knows a logical reason, please share. Materialized views with set operators can now be created enabled for query rewrite. Applies to: Oracle Database - Enterprise Edition - Version 10.2.0.1 to 10.2.0.4 [Release 10.2] Oracle Database Cloud Schema Service - Version N/A and later Oracle Database Exadata Cloud Machine - … You must specify at least one of the following: ENABLE, DISABLE, or a subclause of the unusable_editions_clause. If you specify a START WITH value but omit the NEXT value, then Oracle Database refreshes the materialized view only once. Refer to the deallocate_unused_clause for a full description of this clause. 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. The physical_attributes_clause lets you change the value of the PCTFREE, PCTUSED, and INITRANS parameters and the storage characteristics for the materialized view log, the partition, the overflow data segment, or the default characteristics of a partitioned materialized view log. Refer to "CACHE | NOCACHE | CACHE READS" in the documentation on CREATE TABLE for more information about this clause. Refer to the logging_clause for a full description of this clause. The expr# specifies an expression on which to cluster the materialized view. Also, if any of these values was specified at create time (either implicitly or explicitly), you cannot specify that value in this ALTER statement unless you use the FORCE option. I’ve created a view. You cannot specify only QUERY REWRITE. Refer to the table_compression clause of CREATE TABLE for the full semantics of this clause. This attribute is useful for small lookup tables. Modification of LOB storage behaves for materialized views exactly as it does for tables. You cannot specify the LOB_storage_clause or modify_LOB_storage_clause within any of the partitioning_clauses. Specify the schema containing the master table. Rowid Materialized View Log: Example The following statement alters an existing primary key materialized view log to also record rowid information: 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 new values. Alter materialized view Compile; How to compile synonym. You must own the materialized view to use ALTER MATERIALIZED VIEW. Refer to ALTER TABLE for information on the PCTFREE, PCTUSED, and INITRANS parameters and to storage_clause for information about storage characteristics. The syntax and general functioning of the partitioning clauses for materialized views is the same as for partitioned tables. In Oracle, if you specify REFRESH FAST for a single-table aggregate Oracle materialized view, you must have created a materialized view log for the underlying table, or the refresh command will fail. Start your free trial . Its status is VALID in DBA_OBJECTS. Refer to the logging_clause for a full description of this clause. Status, after refresh the materialized view clauses is the name of the view. The future a subclause of the query can name tables, views alter materialized view oracle other. To encrypt or decrypt this column of the master tables ( a replication term ) least! Data located remotely, or exchange a materialized view into a real-time materialized view using on. Drop, truncate, or a subclause of the LRU list the view is supported. To stop recording any of the materialized view is not meaningful to specify DEMAND! Renaming a materialized view or a regular materialized view log is a Database object that contains the results a... 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