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System administrators sometimes wish to increase the retention time for STAD, so that they can check STAD statistics back over a period of days or weeks.  The main SAP note which discusses this is 6833:

  • 6833 – Deleting statistics file, size of statistics file

As described in the note, the parameter stat/max_files determines how long the STAD data is retained.  The maximum value for stat/max_files is 99 (hours).  99 hours is just over 4 days.

Transaction STAD is only designed for analysis of recent statistics and activity in the system, over the last couple of days.  Statistics from the STAD files get saved into tables (by the SAP_COLLECTOR_FOR_PERFMONITOR job) which are read by transaction ST03, so for analysis and statistics over longer periods than a couple of days you should use ST03, not STAD.

More information and troubleshooting guides (including this one) on the BC-CCM-MON area are available in the CCMS Wiki space at:

Computing Center Management System (CCMS) – Technology Troubleshooting Guide – SCN Wiki

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