In regards to database relations and file usage, not only do you need to know what a physical files database relations are, but also what programs use it and in what capacity.
I run a job every weekend to collect all database relations into a database file. This allows me to run reports against a physical file to locate all programs that use it or any of it's logical files.
/* FILE CROSS REFERENCE REPORT */
Once a week I run the following command in Job Scheduler:
DSPPGMREF PGM(*ALL/*ALL) OUTPUT(*OUTFILE) OUTFILE(PGMREFPF)
Click here to view the code.
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This was first published in January 2003