Oracle Materialized View Editor

Use the Oracle Materialized View Editor to create or edit materialized views.

A materialized view, which is a view that stores the result set of a query against any number of other materialized views, views, and tables. Materialized views can be used to improve the performance of queries. To the database user, a materialized view looks like a real table with a set of named columns and rows of data. However, a materialized view is not a permanently stored set of data values. The rows and columns of data visible through the materialized view are the result of the database query that defines the materialized view.

You can use materialized views to:

Create a customized presentation of the data stored in a database.
Restrict access to data, allowing different users access to only certain rows or columns of a materialized view.
Simplify database access by creating customized structures tailored to the needs of individual users. A user can write a simple query on a materialized view rather than a complex query on the actual database tables.

Materialized views are supported in the following features:

Forward Engineering: When you forward-engineer your data model to generate a database, the SQL code to define the materialized view is generated, and it is stored in the database.
Reverse Engineering: When you reverse-engineer an existing database that includes one or more materialized views, each materialized view is imported, the syntax is parsed, and where possible the relationships to the tables referenced by the materialized view are created.
Complete Compare: When you use complete compare and update a materialized view either in the model or in the database, you can keep the model materialized view specification in sync with the database table specification.

When you add a materialized view to a model, it is represented as a box with rounded corners. A relationship between a table and a materialized view indicates that the materialized view table references one or more of the columns from that table.

The following properties are applicable to an Oracle Materialized View object.

Tab	Section	Property	Description	Additional Information
		Name	Specifies the physical name of the materialized view
		Owner	Specifies the database owner
		Generate	Specifies whether a SQL statement for the materialized view is generated during forward engineering
General	Storage Type	Data Storage Type	Specifies the storage characteristics of the materialized view	Regular: Indicates that the materialized view is a regular materialized view Organized: Indicates that the materialized view rows use an organization type to store rows Cluster: Indicates that the materialized view is a part of the specified cluster
		Data Organization Type	Specifies the organization type for Organized data storage and the order in which the data rows of the materialized view are stored	Available only when Data Storage Type is set to Organized Heap: Indicates that the materialized view is heap-organized and rows do not follow any specific order Index: Indicates that the materialized view is index-organized and rows are held in an index defined on the primary key
		Deferred Segment	Specifies the point at which the database creates materialized view segments	Immediate: Indicates that a segment is created along with the materialized view Deferred: Indicates that a segment is created only when the first row of data is inserted into the materialized view
	Cluster	Oracle Cluster	Specifies the cluster to be used	Available only when Data Storage Type is set to Cluster
	Clustering Columns	Column	Specifies the materialized view columns that correspond to the specified cluster's columns	Available only when Data Storage Type is set to Cluster
	Compression	Compression	Specifies the compression technique to be used to compress data segments	Available only when Data Storage Type is set to Regular or Organized (and Data Organization Type is set to Heap or left blank)
	Index Organization	Percent Threshold	Specifies the space blocked in the index block	Available only when the Data Storage Type is set to Organized and Data Organization Type is set to Index
		Prefix Compression	Specifies whether prefix compression is enabled
		Prefix Compression Value	Specifies the number of prefix columns to compress
		Index Overflow	Specifies whether the row exceeding the Percent Threshold are placed in a data segment
		Including Column	Specifies the column at which a row is divided into index and overflow parts
	Refresh Properties	Refresh State	Specifies whether the materialized view is configured to refresh
		Refresh On What	Specifies the event that triggers the refresh	Demand: Indicates that the database refreshes the materialized view only when a refresh is demanded manually Commit: Indicates that the database refreshes the materialized view whenever a transaction on the master table is committed Statement: Indicates that the database refreshes the materialized view whenever a DML operation is performed on the master table
		Refresh Type	Specifies the refresh method	Fast: Indicates that the refresh operation is performed based on the changes that occur to the master table Complete: Indicates that the refresh operation is performed by executing the query that defines the materialized view Force: Indicates that the refresh operation is performed based on the method (Fast or Complete) that is possible
		Refresh Start Date	Specifies the datetime expression for the first automatic refresh operation
		Refresh Next Date	Specifies the datetime expression to calculate the interval between automatic refresh operations
		Refresh With Key	Specifies the type of key to be used	Primary Key: Indicates that the materialized view is eligible for fast refresh even with master table reorganization Row Id: Indicates that the materialized view is not eligible for fast refresh after a master table reorganization until a complete refresh has been performed
		Refresh Local Rollback Seg State	Specifies the remote rollback segment to be used for the local refresh group that contains the materialized view	Default: Indicates that the database automatically selects a rollback segment to use Specified: Indicates that the database uses a specified rollback segment
		Refresh Local Rollback Seg Reference	Specifies the rollback segment to be used	Available only when the Refresh Local Rollback Seg State is set to Specified
		Refresh Master Rollback Seg State	Specifies the remote rollback segment to be used at the remote master site for an individual materialized view	Default: Indicates that the database automatically selects a rollback segment to use Specified: Indicates that the database uses a specified rollback segment
		Refresh Master Rollback Seg Reference	Specifies the rollback segment to be used	Available only when the Refresh Master Rollback Seg State is set to Specified
		Using Constraint Type	Specifies the constraint type to be used by the database to find more rewrite options during the refresh operation
Storage	Storage	Name	Specifies the physical storage object for the materialized view
Storage	Index Overflow Storage	Name	Specifies the overflow storage object for an index-organized materialized view	Available only when the Data Storage Type is set to Organized and Data Organization Type is set to Index
Other Options	Object Properties	Of Type	Specifies the type object for an object materialized view
	Other Options	Prebuilt Table	Specifies whether an existing table is registered as a preinitialized materialized view
		Reduced Precision	Specifies whether loos of precision is allowed if the precision of the table or materialized view columns do not exactly match the precision returned by subquery
		Default Collation	Specifies the default collation
		Cache	Specifies how data blocks are stored in the buffer cache	No Cache: Indicates that the blocks fetched for a table are placed at the least recently used end of the least recently used (LRU) list in the buffer cache when a full table scan is performed Cache: Indicates that the blocks fetched for a table are placed at the most recently used end of the LRU list in the buffer cache when a full table scan is performed
		Use Parallel	Specifies whether parallel operations are supported for the materialized view
		Parallel	Specifies the degree of parallelism (the number of parallel threads)
		Build Clause	Specifies when the materialized view is populated	Immediate: Indicates that the materialized view is populated immediately on creation Deferred: Indicates that the materialized view is populated by the next REFRESH operation
		Use Index	Specifies whether a default index is used to maintain materialized view data	Use Default Index: Indicates that a default index is used speed up incremental refresh of the materialized view Use No Index: Indicates that a default index is not created
		Index	Specifies the default index name	Available only when Use Index is set to Use Default Index
		Computation Query State	Specifies whether a real-time materialized view is created so that up-to-date is available for queries even when the materialized view is not in sync with the base table
		Query Rewrite State	Specifies whether the materialized view is eligible to be used for query rewrite

The Oracle Materialized View Editor also includes the following tabs:

Select Lets you specify the tables, views, or materialized views to use to define the materialized view and create aliases and expressions.
From Lets you specify the tables, views, and materialized views that you want to participate in the materialzied view.
Where Lets you enter text to define a WHERE clause.
User Defined SQL Lets you view and change a user-provided DDL statement.
SQL Lets you view the SQL code used during Forward Engineering.
Style Lets you work with style sheets, which are used to format the font and other graphical themes used in the display of the materialized view.
Icon Lets you specify the icon style to use for the materialized view.
Alias Lets you add, modify, or delete synonyms for the materialized view.
Comment Lets you enter any comments that you want to associate with the materialized view.
Object Creation Order Lets you specify the order of DDL generation.
UDP Lets you enter user-defined property values for a materialized view.
History Lets you view the history details for the materialized view.
Notes Lets you view materialized view history information and view or edit user notes.
Extended Notes Lets you edit user notes or transfer notes to the Notes tab.