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SEMMNU defines the maximum number of System V IPC undo structures for processes. see the following note for recommended setting for your OS.
Oracle Database on Unix AIX,HP-UX,Linux,Mac OS X,Solaris,Tru64 Unix Operating Systems Installation and Configuration Requirements Quick Reference (8.0.5 to 11.2) [ID 169706.1]
If you dont set it to recommended setting, most likely the moon will leave earths orbit. change it to recommended setting and save the world from tidal catastrophe.