Input Data Sets (Source)

When running IBM® Transformation Extender maps using input (source) data sets, the following recommendation might improve the performance of batch jobs running under the Batch Command Server.

Verify that all input (source) data sets were originally created with an optimum block size. Optimum block sizes on IBM DASD devices are one half-track of data.

This verification should occur on a case-by-case (job-by-job) basis if you suspect there might be performance problems relating to running Batch Command Server jobs.

If through this verification process, you determine that the input (source) data sets do not have optimal block sizes, you can perform the following:

• Identify the creators of the data sets
• Confirm that re-blocking the input (source) data sets will not have any adverse affect on any other potential consumers of them
• Re-block the input (source) data sets
  Note: There might be instances where re-blocking the input (source) data sets might not be a viable option for various reasons including but not limited to external vendor specifications or other factors driving the application requirements.
  Note: See the following IBM manuals for specific details:
  
  - DFSMS: Using Data Sets
  - DFSMS: Implementing System-Managed Storage