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Generating Denso QR Bar Code in C#.NET Managing Partitions and Database Processing

Consequently, some databases are simply too large to process as a single transaction. Analysis Services provides several options for processing individual components of a database. These options allow you to create and manage extremely large databases, but they also require much more work to avoid preventing users from accessing the cubes or, worse, to avoid including invalid or inconsistent values in the cubes.

When you process a dimension, the server creates a map that includes the path for each member of that dimension. Every cube that includes the dimension uses that map. When you process an existing dimension, the map is destroyed and a new map is created. Destroying the dimension map invalidates all the cubes that use the dimension. When you process an entire database, new dimensions are processed first and then all the cubes are processed as well. But when you process a single dimension, you make all the cubes that use that dimension inaccessible to client applications. Fortunately, you can make certain changes to a dimension without destroying the existing map. If you don t destroy the existing map, you don t invalidate existing cubes. Analysis Services allows you to incrementally update a dimension to make changes that don t destroy the dimension map. The most useful change you can then make is adding new members to a dimension. You can also delete members or change attribute values. To enable you to perform an incremental update on a dimension when you delete or rename an existing member, or change the attribute relationships for a member, the default value of RelationshipType property for each attribute relationship is Flexible. If this property is set instead to Rigid and you try to run an incremental update, Analysis Services will fail the operation if it detects changes in the dimension table that aren t allowed. Deleting or changing members of a rigid relationship requires the dimension to be fully reprocessed, which in turn forces each cube using the dimension to be reprocessed. In this procedure, you ll compare the Process Full and Process Update processing options for updates to the Sales Territory dimension. Update a dimension 1. In the Object Explorer of SQL Server Management Studio, expand the Dimensions folder for the Working with Storage database, right-click Sales Territory, and then click Process.

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Your screen looks like this:

Notice the Process Options value is Process Update. Analysis Services selects the processing option that brings the dimension object up-to-date. In this case, because no structural changes are detected in the dimension design, Analysis Services determines that full processing is not required, and suggests an incremental update instead. The processing option for incremental updates, Process Update, is appropriate when you make changes to the dimension table. However, you will change this value to Process Full to observe the impact on cubes by using this option instead. Notice the current setting for Process Affected Objects, visible at the bottom of the dialog box, is Do Not Process. Thus, any objects dependent on this dimension, such as partitions in the cube, will not be processed. Before you begin processing, you can review the impact of processing the Sales Territory dimension on other objects in the database by using the Impact Analysis feature. 2. Select Process Full in the Process Options drop-down list, and then click Impact Analysis.

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Your screen looks like this:

The information on this screen tells you that if you proceed with a full process of the Sales Territory, all measure groups, partitions, and cubes in the database will also need to be processed. You can be selective about which objects to process after processing Sales Territory. For this procedure, you won t select any of these objects to process. 3. Click OK twice, and then click Close when processing is complete. 4. Browse the MOLAP cube in SQL Server Management Studio. You see an error message indicating that the cube cannot be browsed. By performing a full process of the Sales Territory dimension, the MOLAP cube was placed in an unprocessed state and now requires processing. 5. Browse the ROLAP cube. Even though the ROLAP cube always reads fact data from the relational table, it is still dependent on dimension maps. When the dimension map for Sales Territory is rebuilt, the ROLAP cube must be reprocessed in order to reference the new dimension map.

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