This document describes how you can unload the User ID (Userid) from your Standard Activity collection.
Will my Standard Activity unload file contain the User ID (Userid)?
z/OS 1.11 and above.
The User ID is only unloaded for Standard Activity records when the 3 conditions below are met:
1) The KEYS option is enabled during the collection
2) The DATAYPE parameter is set to either "STAN" or "ALL" in the Unload job
3) The UNLDKEYS parameter is set to "Y" in the Unload job
The USERID is automatically populated whenever Errors & Exceptions are unloaded.