To give a good answer, requires knowing more about the file [a database file?] and its packed data, how the file and that data needs to be used [as a database file with the packed data column?], how the data gets into the DW, and where the DW resides [presumably on an ASCII system?].

If the file is only getting to the i5/OS system as an intermediary, such that the data is unused except to transform for a push to the DW, then the best option is to have the data properly exported from the vendor and eliminate the intermediate step. If the file needs to be used for its packed data when it arrives from the vendor, then changing the data in the file would not be best. Copying of data is not ideal, for its CPU & storage requirements, and thus possibly just a logical view of the existing data is best. But each /if/ is an unknown for the scenario, requiring more details.

Regards, Chuck

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