Issue :
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While starting database using sqlplus, the below error message shown

ORA-27154: post/wait create failed
ORA-27300: OS system dependent operation:semget failed with status: 28
ORA-27301: OS failure message: No space left on device
ORA-27302: failure occurred at: sskgpsemsper

Solution :
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vi /etc/sysctl.conf
kernel.sem = 256 32768 100 228

sysctl -p