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SSIS Interview Question: What is the difference between a Control Flow Task and a Data Flow Task?
In SQL Server Integration Services (SSIS), control flow tasks and data flow tasks are fundamental components for designing and executing ETL processes. Understanding the differences between these tasks is crucial for efficient data integration. Here are the key distinctions:
Control Flow Task:
- Used for orchestrating the flow of the entire ETL process.
- Manages workflow control, including executing tasks in a specified order, handling errors, and defining conditional logic.
- Examples of control flow tasks include Execute SQL Task, File System Task, and Script Task.
Data Flow Task:
- Primarily responsible for moving data between sources and destinations.
- Employs data pipelines to transform and manipulate data during the transfer process.
- Utilizes components such as Source, Transformation, and Destination to define data flow logic.
In summary, while control flow tasks manage the overall workflow and execution sequence, data flow tasks focus specifically on data movement and transformation within the ETL process.
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