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What two characteristics of Data Sets make them a good design consideration in your jobs design change?

You have a parallel job that based on operational recoverability requirements needs to be broken
up into two separate parallel jobs. You have decided to use the Data Set stage to support this job
design change. What two characteristics of Data Sets make them a good design consideration in
your jobs design change? (Choose two.)

What could the original developer have done to make this task easier for maintenance purposes?

You are assigned to correct a job from another developer. The job contains 20 stages sourcing
data from two Data Sets and many sequential files. The annotation in the job indicates who wrote
the job and when, not the objective of the job. All link and stage names use the default names.
One of the output columns has an incorrect value which should have been obtained using a
lookup. What could the original developer have done to make this task easier for maintenance
purposes?