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I just finished the Externalizing I/O section, and I'm not really sure it helps with the "hack the DB one more time" mentioned at the start.

We're just finishing up what I imagine is a typical DB change issue. We have a table with several columns that need to be lengthened. The table is used in 800-900 programs, some still using I-specs. We of course had no practical choice but to add new columns at the end and orphan the old ones.

The sample app exposes (via EXPORT/IMPORT) data structures defined off PF record formats. How does that help with DB changes? If you change the table and service program, the service program will be exposing a different layout of the DS than calling programs expect which will cause errors.

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