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I have got deeper in user documentation and have got some more information. Deletion of archived SYSDATA is managed automaticaly by Newday procedure - CTMTDAY
05.00.32 DAS613I DELETE OF ARCHIVED SYSOUTS STARTED
05.00.32 DAS614I DELETE OF ARCHIVED SYSOUTS ENDED
Deleted archived SYSOUT are the data, which do not belong to history file.
If we have a uneeded records in AJF, for example jobs with status DELETED, we might want to use Utility CTMAJF. This utility can Compres AJF, which will make a space in AJF.