TAILIEUCHUNG - Hands-On Microsoft SQL Server 2008 Integration Services part 37

Hands-On Microsoft SQL Server 2008 Integration Services part 37. Deploy and manage high-performance data transformation solutions across your enterprise using the step-by-step techniques in this fully revised guide. Hands-On Microsoft SQL Server 2008 Integration Services, Second Edition explains the tools and methods necessary to extract conclusive business intelligence from disparate corporate data. Learn how to build and secure packages, load and cleanse data, establish workflow, and optimize performance. Real-world examples, detailed illustrations, and hands-on exercises are included throughout this practical resource. . | 338 Hands-On Microsoft SQL Server 2008 Integration Services External data source Person Name Sex House_Number Moved_in varchar 50 bit int datetime Sarah 25-21-2004 0 130 Steve 250 07-11-2005 Figure 9-1 A data flow source extracting and parsing data data into the Integration Services data type. During design time when you drop the data flow source onto the Data Flow Designer surface and configure it to connect to an external data source from which data will be read the data flow source copies the metadata . the schema of the data to its external columns metadata. At run time when the data is being pulled in the incoming data columns are parsed into the Integration Services data types using the external columns metadata. In the example the names Steve and Sarah are parsed into the DT_STR data type sex which is indicated using 1 and 0 and have been assigned DT_BOOL House_ Number has been assigned DT_I4 and the Moved_in data has been assigned the DT_ DBTIMESTAMP data type. Integration Services provides 29 different data types to cover various types of data such as character data numerical data Boolean dates text and image fields. Integration Services provides a wide range of data types and is particular about how they are used hence if data has a data type that does not match with the data types available in Integration Services an error occurs. We will explore many data types along the way as we progress with our Hands-On exercises however to know more about each data type refer to Microsoft SQL Server 2008 Books Online. The process that converts the source data into Integration Services data types is called data parsing. Data flow components can be configured to use either fast parsing or standard parsing. Fast parsing supports the most commonly used data types with a simple set of routines and can be configured at the column level. Because it uses simple routines and does not check for many other data types it can achieve high levels of performance. However it is

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