Re: clone creations fails with shared memory realm already exists

 Correction. "0 size" in my message should be "0 nattch". The size is mostly pagesize, 4k, not 0. Also, very rarely, an entry in /dev/shm is a leftover not cleaned up properly when the instance was shut down. So just because an entry /dev/shm/*<shmid>* exists doesn't mean its shared memory segment definitely cannot be removed. Since the name is like /dev/shm/ora_<SID>_<shmid>_<seq#>, you as a DBA know if this SID is still running. Yong

    On Saturday, February 9, 2019, 10:22:52 AM CST, Yong Huang <yong321_at_yahoo.com> wrote:  

 Noveljic and Jeff,
The 0 size shared memory segments seen in `ipcs -m' are probably due to +ASM and/or DB instances using AMM. Check /dev/shm/*<shmid>* to find out. Trying to remove them with the Oracle command `sysresv -f' will give you a warning, unlike ipcrm, which is a pure OS tool. Yong   

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