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Running cleanipc on AIX

The cleanipc command is used to clear the shared memeory occupied by the SAP system. Mostly, this command is used (by <sid>adm user) while restarting an SAP system. So, you stop the system using stopsap, run the cleanipc command to clear the memory and then start the system using startsap.

Command: cleanipc <instance_nr> remove

However, sometimes, cleanipc fails to cleanup some semaphores saying: Semaphore Key: XX remove failed **** – errno = 1 (Not owner)

Command: cleanipc 06 remove


In this case, login as root and run the following commands:

ipcs –s | grep “the number from the semaphore”

ipcrm –s “the number from the above command”


The above command ipcrm clears up the semaphore which was not cleared by cleanipc command when executed by <sid>adm user. Now, if you run cleanipc again using <sid>adm, you will find that the affected semaphore is now cleared.


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  • running 'slibclean' as 'root' usually also helps. this command cleans all *unused* libraries from memory. As root-privs are sometimes not given to SAP-admins, the command is usually provided through sudo.

  • Hello Shitij

    I needed change AIX user ID for <sid>ADM in Bank Analyzer system and don't execute cleanipc before this. When i execute cleanip all smaphore and Shared Memory report "Not Owner" error; I cleaned memory with same commands but with -m option:

    ipcs –ma | grep “The number from the shared Memory Key ”

    ipcrm –m “the ID number from the above command”

    Following I used your commands... and cleanipc show correct response and all service start correctly

    Thank you!!!!