Chapter 4The Data Flow

  • Learn about the SSIS Data Flow architecture
  • Reading data out of sources
  • Loading data into destinations
  • Transforming data with common transformations

You can find the wrox.com code downloads for this chapter at www.wrox.com/go/prossis2014 on the Download Code tab.

In the last chapter you were introduced to the Control Flow tab through tasks. In this chapter, you’ll continue along those lines with an exploration of the Data Flow tab, which is where you will spend most of your time as an SSIS developer. The Data Flow Task is where the bulk of your data heavy lifting occurs in SSIS. This chapter walks you through the transformations in the Data Flow Task, demonstrating how they can help you move and clean your data. You’ll notice a few components (the CDC ones) aren’t covered in this chapter. Those needed more coverage than this chapter had room for and are covered in Chapter 11.

UNDERSTANDING THE DATA FLOW

The SSIS Data Flow is implemented as a logical pipeline, where data flows from one or more sources, through whatever transformations are needed to cleanse and reshape it for its new purpose, and into one or more destinations. The Data Flow does its work primarily in memory, which gives SSIS its strength, allowing the Data Flow to perform faster than any ELT type environment (in most cases) where the data is first loaded into a staging environment and then cleansed with a SQL statement. ...

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