In this solution let us see how to increase the value of the semaphore in Linux for increasing the processes while we try to start the Oracle multi-instances.

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: sskgpcreates


To change the value of the semaphore we can perform by editing the below file.

# vi /etc/sysctl.conf

kernel.sem = 250 32000 100 428


Semaphores Value has been configured to take effect we need to run

# sysctl -p


That’s it we can now start the Oracle Database instances by avoiding above error.

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