c# code 128 auto CHAPTER 7 Managing SSAS Storage, Processing, and Deployment in Visual C#.NET

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296 CHAPTER 7 Managing SSAS Storage, Processing, and Deployment
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figure 7-24 The Impact Analysis dialog box shows the objects that will be invalidated by a given pro-
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You can use the Process Object column to select the objects you want to process. Figure 7-24 shows the Adventure Works cube and all of its containing objects. Because, in this case, the cube contains the rest of the objects, you can select just the Adventure Works cube to process all objects, or you can select objects to be processed and leave the others in an unprocessed state.
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understanding Processing Settings
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You can click the Change Settings button in the Process dialog box to change the default processing settings. Figure 7-25 shows the Change Settings dialog box. By default, the server processes batch objects in parallel and chooses the number of concurrent jobs on its own. The Process Order setting lets you overwrite this behavior. You can limit the maximum number of processing tasks that run in parallel, or you can tell the server to process objects in a batch, sequentially. The Writeback Table Option applies only to partitions that users can make data changes to. Writeback changes are written to a dedicated table in the data source. You can instruct the server to either create a new writeback table or use an existing one. Last, you can use the Dimension Key Errors tab if you need to overwrite the default error configuration for example, you might want to abort processing if a duplicate dimension key is found.
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Lesson 3: Processing SSAS Objects CHAPTER 7 297
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figure 7-25 The Change Settings dialog box lets you overwrite the default server Processing Options and the Dimension Key Errors configuration.
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If SSAS encounters a null value in a key column when processing dimension data, by default, it converts the value to zero for numeric columns or to an empty string for string columns. As you can see by inspecting the default ErrorConfiguration settings for the dimension and the Dimension Key Errors tab of the Change Settings dialog box, the server ignores the nullKeyConvertedtounknown error. However, if the dimension does not have an unknown member enabled, the processing task will fail. To enable the unknown dimension member, change its unknownMember property from none to visible or Hidden (if you do not want end users to see the unknown member). By default, the label of the unknown member is unknown. However, you can specify a custom label by setting the dimension-level unknownMembername property. When the unknown member is enabled, end users will see all members with null keys grouped under the unknown member. Although SSAS provides exible processing options, as a best practice, you should resolve data inconsistencies during the ETL process.
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Managing SSAS Storage, Processing, and Deployment
Process errors usually result from data inconsistencies, such as referential integrity violations. Recall that you can specify custom error configurations at dimension, cube, measure group, and partition levels. The Change Settings dialog box s Dimension Key Errors tab lets you overwrite these settings for the duration of the processing operation.
Monitoring Processing Progress
When the server processes objects, it raises trace events to which client applications can subscribe to see progress reports. The Process Progress dialog box listens to these events and shows the progress of the processing operation. You can see which objects are being processed in parallel, the duration of the processing job, the SQL SELECT statement that the server sends to the data source to load data, and the number of rows retrieved, as Figure 7-26 shows. In the case of an error, the Process Progress dialog box shows the error message.
figure 7-26 The Process Progress dialog box shows the progress and the status of the processing task.
Depending on the error configuration settings, errors might abort the processing operation. If this happens, you need to look at the error message or the error log file to find the problem, resolve the error, and restart the processing operation.
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