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S/4 1909 System hangs every hour

every hour, at 10 minutes after the hour, the system hangs up for 3-10 minutes. When it frees up the load average for dialog in SM50 is very high. I see in ST02 that CUA swapping is very high also. I cannot seem to track down the culprit. SM37 doesn't show any batch jobs running around that time, nor any that take more than a few seconds. Any help on where to start looking?

Not a BASIS expert.. I've read through SAP Support but can't pin anything down.

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  • Posted on Aug 19 at 09:30 PM

    Hi Paul,

    You can start with

    st03n--.last minute load and search with time interval

    st06 for CPU and memory

    check STAD for same time and narrow down user /program

    I hope it will give far idea.

    But same time you can check if there is any non sap process running at server level which is causing high CPU utilization.

    Best Regards,


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  • Posted on Aug 19 at 11:37 PM

    Hi Paul,

    You can use ST03 to analyze the wait time. This wiki should help.

    About the swaps, please go through KBA 1918603 (ST02 - Swaps in various buffers).

    You can also check whether you have enough work processes. SAP Note 39412 (How many work processes should be configured?) can help in this matter.

    Kind regards,


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