TAILIEUCHUNG - SQL Server MVP Deep Dives- P20

SQL Server MVP Deep Dives- P20: Each year Microsoft invites all the MVPs from every technology and country to Redmond for an MVP Summit—all top secret—“don’t tweet what you see!” During the MVP Summit, each product team holds a series of presentations where they explain their technologies, share their vision, and listen to some honest feedback. | 714 Chapter 56 Incorporating data profiling in the ETL process inside the package. Typically you will store the XML in a file if you are profiling data to be reviewed by a person at a later time and plan on using the Data Profile Viewer application to review it. Storing the XML output in a variable is most often done when you want to use the profile information later in the same package perhaps to make an automated decision about data quality. The XML output includes both the profile requests the input to the task and the output from each profile requested. The format of the output varies depending on which profile generated it so you will see different elements in the XML for a Column Null Ratio profile than you will for a Column Length Distribution profile. The XML contains a lot of information and it can be difficult to sort through to find the information you are looking for. Fortunately there is an easier user interface to use. The Data Profile Viewer shown in figure 2 provides a graphical interface to the data profile information. You can open XML files generated by the Data Profiling task in it and find specific information much more easily. In addition the viewer represents some of the profile information graphically which is useful when you are looking at large quantities of data. For example the Column Length Distribution profile displays the count associated with specific lengths as a stacked bar chart which means you can easily locate the most frequently used lengths. Figure 2 Data Profile Viewer Please purchase PDF Split-Merge on to remove this watermark. Introduction to the Data Profiling task 715 The Data Profile Viewer lets you sort most columns in the tables that it displays which can aid you in exploring the data. It also allows you to drill down into the detail data in the source system. This is particularly useful when you have located some bad data in the profile because you can see the source rows that contain the data. This .

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