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InfoSphere DataStage Parallel Framework Standard Practices by Paul Christensen, Julius Lerm

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Job parameter and environment variable management
An overview of DataStage (DS) job parameters can be found in the IBM InfoSphere DataStage and QualityStage Designer Client Guide, LC18-9893.
DataStage jobs can be parameterized to allow for portability and flexibility. Parameters are used to pass values for variables into jobs at run time. There are two types of parameters supported by DataStage jobs:
Standard job parameters
 – Are defined on a per job basis in the job properties dialog box.
 – The scope of a parameter is restricted to the job. ...

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