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Results for materialized views


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Database Concepts, 11g Release 1 (11.1)

Information Integration

Materialized ViewsOracle Streams is fully inter-operational with materialized views, or snapshots, which can be used … criterion. There can be multitier materialized views as well, where one materialized view is based … on another materialized view. Materialized views

Database Concepts, 11g Release 1 (11.1)

Schema Objects

Overview of Materialized ViewsMaterialized views are schema objects that can be used to summarize, compute, replicate, and … support, and distributed or mobile computing: In data warehouses, materialized views are used to … compute and store aggregated data such as sums and averages. Materialized views in these environments

Database Concepts, 11g Release 1 (11.1)

Schema Objects

Refresh Materialized ViewsOracle Database maintains the data in materialized views by refreshing them after changes are made … materialized views that use the fast refresh method, a materialized view log or direct loader log keeps … a record of changes to the master tables. Materialized views

Database Administrator's Guide, 11g Release 1 (11.1)

Analyzing Tables, Indexes, and Clusters

Validating Tables, Indexes, Clusters, and Materialized ViewsTo verify the integrity of the structure of a table, index, cluster, or materialized view, use the … cluster is corrupt, you should drop it and re-create it. If a materialized view is corrupt, perform … , drop and re-create the materialized view. The following statement analyzes the emp table: ANALYZE

Database Concepts, 11g Release 1 (11.1)

Business Intelligence

Overview of Materialized Views for Data Warehousesare created in Oracle Database using a schema object called a materialized view. Materialized views … . The database administrator creates one or more materialized views, which are the equivalent of a … reduces response time for returning results from the query. Materialized views

Database Upgrade Guide, 11g Release 1 (11.1)

Behavior Changes

Materialized Views… The new names appear in all data dictionary views, but both the old and new names are accepted by the … GRANT and REVOKE SQL statements. CREATE SNAPSHOT changed to CREATE MATERIALIZED VIEW CREATE ANY … SNAPSHOT changed to CREATE ANY MATERIALIZED VIEW ALTER ANY SNAPSHOT changed to ALTER ANY MATERIALIZED

Database Data Warehousing Guide, 11g Release 1 (11.1)

Basic Materialized Views

Creating Materialized ViewsViews\". Once you have selected the materialized views you want to create, follow these steps for each … materialized view. Design the materialized view. Existing user-defined materialized views do not … A materialized view can be created with the CREATE

Database Data Warehousing Guide, 11g Release 1 (11.1)

Advanced Materialized Views

Altering Materialized Views: Oracle Database SQL Language Reference for further information about the ALTER MATERIALIZED VIEW statement and \"Invalidating Materialized Views\" … Six modifications can be made to a materialized view. You can: Change its refresh option ( FAST … are achieved by dropping and then re-creating the materialized

Database Data Warehousing Guide, 11g Release 1 (11.1)

Maintaining the Data Warehouse

Refreshing Materialized Views… Alternatively, you can control the time when refresh of the materialized views occurs by specifying ON DEMAND … Refresh one or more materialized views. DBMS_MVIEW.REFRESH_ALL_MVIEWS Refresh all materializedviews. DBMS_MVIEW.REFRESH_DEPENDENT Refresh all materialized

Database Data Warehousing Guide, 11g Release 1 (11.1)

Basic Materialized Views

Materialized Views with AggregatesIn data warehouses, materialized views normally contain aggregates as shown in Example 8-1. For … Materialized Views with Aggregates\". Fast refresh for a materialized view containing joins and … tables upon which the materialized view is based. Here are some examples of materialized

Database Data Warehousing Guide, 11g Release 1 (11.1)

Basic Materialized Views

Dropping Materialized ViewsUse the DROP MATERIALIZED VIEW statement to drop a materialized view. For example. the following … statement: DROP MATERIALIZED VIEW sales_sum_mv; This statement drops the materialized view … sales_sum_mv. If the materialized view was prebuilt on a table, then the table is not dropped, but it can no

Database Data Warehousing Guide, 11g Release 1 (11.1)

Advanced Materialized Views

Rolling Materialized Viewsscenario. If the fact tables or materialized views include a time dimension and are horizontally … partitioned by the time attribute, then management of rolling materialized views can be reduced to a … at least aligned with, the range partitions. If you plan to have rolling materialized views

Database Data Warehousing Guide, 11g Release 1 (11.1)

Advanced Materialized Views

Compressing Materialized Viewsforeign keys. In particular, materialized views created with the ROLLUP clause are likely candidates

Database Data Warehousing Guide, 11g Release 1 (11.1)

Advanced Materialized Views

Materialized Views and ModelsModels, which provide array-based computations in SQL, can be used in materialized views. Because … the MODEL clause calculations can be expensive, you may want to use two separate materialized views … using one, long materialized view, you could create the following materialized views:

Database Data Warehousing Guide, 11g Release 1 (11.1)

Basic Materialized Views

Nested Materialized Viewsreferencing materialized views. Why Use Nested Materialized Views? In a data warehouse, you typically … ). Incrementally maintaining these distinct materialized aggregate views can take a long time, because the … underlying join has to be performed many times. Using nested materialized

Database Data Warehousing Guide, 11g Release 1 (11.1)

Basic Materialized Views

Naming Materialized Views, you might consider extending this naming scheme to the materialized views so that they are easily … The name of a materialized view must conform to standard Oracle naming conventions. However, if the … materialized view is based on a user-defined prebuilt table, then the name of the materialized view

Database Data Warehousing Guide, 11g Release 1 (11.1)

Basic Materialized Views

Registering Existing Materialized ViewsSome data warehouses have implemented materialized views in ordinary user tables. Although this … solution provides the performance benefits of materialized views, it does not: Provide query rewrite to … all SQL applications. Enable materialized views defined in one application to be

Database Data Warehousing Guide, 11g Release 1 (11.1)

Advanced Materialized Views

Partitioning and Materialized Views… Partitioning the fact tables also improves the opportunity of fast refreshing the materialized view … because this may enable Partition Change Tracking (PCT) refresh on the materialized view. Partitioning … a materialized view also has benefits for refresh, because the refresh procedure can then use … the materialized

Database Utilities, 11g Release 1 (11.1)

Original Export and Import

Materialized Views and Snapshotsreferred to as materialized views. This section retains the term snapshot. The three interrelated objects

Database Data Warehousing Guide, 11g Release 1 (11.1)

Advanced Materialized Views

9 Advanced Materialized ViewsThis chapter discusses advanced topics in using materialized views. It contains the following … topics: Partitioning and Materialized Views Materialized Views in Analytic Processing Environments … Materialized Views and Models Invalidating Materialized